---
product_id: 77741296
title: "Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned"
brand: "mjr tumblers"
price: "¥5882"
currency: JPY
in_stock: true
reviews_count: 8
category: "Mjr Tumblers"
url: https://www.desertcart.jp/products/77741296-refill-grit-kit-w-mjr-tumblers-premium-quality-extreme-polish
store_origin: JP
region: Japan
---

# Premeasured 4-stage grit kit 12,000 grit sub-micron polish Veteran & Disabled owned USA brand Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned

**Brand:** mjr tumblers
**Price:** ¥5882
**Availability:** ✅ In Stock

## Summary

> ✨ Polish Like a Pro, Rock the Results! ⚙️

## Quick Answers

- **What is this?** Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned by mjr tumblers
- **How much does it cost?** ¥5882 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/77741296-refill-grit-kit-w-mjr-tumblers-premium-quality-extreme-polish)

## Best For

- mjr tumblers enthusiasts

## Why This Product

- Trusted mjr tumblers brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete Grit Spectrum:** Includes coarse, fine, pre-polish, and extreme polish for professional-grade rock tumbling results.
- • **Expert Guidance Included:** Detailed, heartfelt instructions with tips and tricks to elevate your tumbling game every time.
- • **Effortless 4-Stage System:** Premeasured grits for seamless use in all rotary and vibratory tumblers—just pour and tumble.
- • **Unmatched Polish Precision:** Experience the finest 12,000 grit aluminum oxide polish for mirror-like rock finishes.
- • **Crafted with Care & Integrity:** Proudly disabled and veteran owned, supporting American craftsmanship from Pecatonica, Illinois.

## Overview

MJR Tumblers' Refill Grit Kit delivers a premium 4-stage rock tumbling experience featuring exclusive 12,000 grit sub-micron aluminum oxide polish. Designed for 3lb rotary and vibratory tumblers, this premeasured kit ensures flawless, mirror-quality finishes. Veteran and disabled owned, this American-made kit combines quality materials with expert instructions to guarantee unparalleled polishing results.

## Description

Product description

Review: This is TRUE GRIT! - This is simply some of the best quality tumbler grit I have used. If you do the first three stages properly, then the 12,000 girt polish will be perfect. All in all this is good, works well in each stage, easy to use. the only thing that might make it better would be to package it in bottles instead of bags, but honestly, that's about it.
Review: Passion-fueled and high quality - This grit and polish set is exceptional. You can tell it was crafted by people who genuinely care — not just about rocks, but about the process and purpose. This company emanates expertise and enthusiasm, and that shows in the results. My rocks came out more beautiful than ever and I would prefer to buy only from these rock guys. The picture is of some rocks from my apartment landscaping after the process . The instructions are detailed but easy to follow. It’s not your typical instruction manual, rather a sincere document created by the seller from the heart (their tips and tricks included!). It’s really unique and special. I’ve been using a “gimmicky” tumbler set for my HS STEM program and at home with my kids. As a teacher, is a great tool for many lessons and even many subjects.

## Features

- Extreme Polish! Every rock tumbling kit from MJR Tumblers comes with our Exclusive 12,000 Grit Sub Micron Extreme Aluminum Oxide Polish! No other polish even comes close to our results. If you want the best, MJR Tumblers 12,000 Grit Aluminum Oxide Extreme Polish is what you need!
- MJR Tumblers is a Disabled and Veteran Owned Company!
- Premeasured and works with all rotary and vibratory tumblers. All 4 Stages are premeasured for your tumbler, just pour and roll! It Cant get easier than that!
- Each 3lb kit contains the following: 3oz of course 60/90 silicon carbide grit, 3oz of fine 120/220 silicon carbide grit, 1.5oz of pre polish 400/600 silicon carbide grit, 1.5oz of MJR Tumblers Exclusive 12,000 grit Extreme Aluminum Oxide Polish
- MJR Tumblers is Proud to be an American company located in Pecatonica Illinois in the good ole USA!
- Includes easy to understand rock polishing instructions with lots of tips and tricks with every purchase from MJR Tumblers!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07DZ54NQN |
| Best Sellers Rank | #13,236 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Tumbling Media |
| Brand | MJR Tumblers |
| Brand Name | MJR Tumblers |
| Compatible Material | Aluminum Oxide; Silicon Carbide |
| Customer Reviews | 4.4 out of 5 stars 1,203 Reviews |
| Grit Material | Aluminum Oxide; Silicon Carbide |
| Grit Material Type | Aluminum Oxide; Silicon Carbide |
| Grit Number | 12000 |
| Grit Type | Coarse; Fine; Pre Polish; Polish |
| Item Dimensions | 8 x 6 x 0.4 inches |
| Item Weight | 8.96 ounces |
| Item dimensions L x W x H | 8 x 6 x 0.4 inches |
| Manufacturer | MJR Tumblers |
| Material | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Material Type | Aluminum Oxide, Plastic Pellets, Silicon Carbide |
| Unit Count | 4.0 Count |

## Product Details

- **Brand:** MJR Tumblers
- **Grit Material:** Aluminum Oxide; Silicon Carbide
- **Grit Type:** Coarse; Fine; Pre Polish; Polish
- **Item dimensions L x W x H:** 8 x 6 x 0.4 inches
- **Material:** Aluminum Oxide, Plastic Pellets, Silicon Carbide

## Images

![Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned - Image 1](https://m.media-amazon.com/images/I/61aeQRPy1vL.jpg)

## Questions & Answers

**Q: Can you use this for a 1 lb National Geographic tumbler**
A: It should work just fine. This is just the grit and the grit is usable in any tumbler.

**Q: Can this grit be used for grinding and polishing rock thin sections?**
A: i would think so

**Q: After the polish, are the rocks glossy and shiny?**
A: They won't be as shiny as you think.  The grit polish the rocks so try are smooth but there is a fifth stage in rock polishing called burnishing that you have to do at the end.  Search the internet on directions but it involves tumbling them in soap like borax. Also, if you want your rocks to look good you have to get the ceramic filler pellets to even out the tumbles.  Plastic doesn't do the trick like ceramic.  Filler pellets vs no filler pellets is a big difference on helping the rocks get shiny.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This is TRUE GRIT!
*by J***E on December 15, 2025*

This is simply some of the best quality tumbler grit I have used. If you do the first three stages properly, then the 12,000 girt polish will be perfect. All in all this is good, works well in each stage, easy to use. the only thing that might make it better would be to package it in bottles instead of bags, but honestly, that's about it.

### ⭐⭐⭐⭐⭐ Passion-fueled and high quality
*by K***A on July 11, 2025*

This grit and polish set is exceptional. You can tell it was crafted by people who genuinely care — not just about rocks, but about the process and purpose. This company emanates expertise and enthusiasm, and that shows in the results. My rocks came out more beautiful than ever and I would prefer to buy only from these rock guys. The picture is of some rocks from my apartment landscaping after the process . The instructions are detailed but easy to follow. It’s not your typical instruction manual, rather a sincere document created by the seller from the heart (their tips and tricks included!). It’s really unique and special. I’ve been using a “gimmicky” tumbler set for my HS STEM program and at home with my kids. As a teacher, is a great tool for many lessons and even many subjects.

### ⭐⭐⭐⭐⭐ MAKES TUMBLING ROCKS SO MUCH EASIER
*by A***P on September 3, 2025*

This grit works just like all others, if used correctly. It is so easy to open and pour it into tumbler--the perfect amount for a 10-lb tumbler. Highly recommended.

## Frequently Bought Together

- Refill Grit Kit w MJR Tumblers Premium Quality Extreme Polish 12,000 Grit Sub Micron Aluminum Oxide Polish for Unparalleled Results. For 3lb Rock Tumblers w Silicon Carbide, Disabled and Veteran Owned
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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-04*