Would these be ok for playyard or do you think they would get brittle staying outside?

They're pretty thick and plyable so they'd be OK for a long while. I think it'd be better in the shade tho

Are these all different heights?

Yes they are different heights. They are very sturdy and well made. My grandkids love them.

I have no idea. The children have great fun on them.

Is there a weight limit on this toy? Are they durable enough for an adult to stand on?

As per description: "Can withstand weights up to 110lbs."I would say a petite adult can safely stand on them, but not use them on a regular basis. They are made for children.

Riverstones | Desertcart Japan

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥59265

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Step up your child’s playtime game with confidence and style!

DURABLE KID PROOF BUILD - High-quality materials support up to 220 lbs for long-lasting fun.
SPACE SAVING STACK STORE - Easily stack all 6 stones for neat, compact storage.
SAFE SLIP RESISTANT DESIGN - Non-slip rubber rims ensure secure play indoors and outdoors.
CUSTOMIZABLE CHALLENGE LEVELS - Triangular stones offer varying steepness for evolving skillsets.
MASTER BALANCE COORDINATION - Boost your child's motor skills with every confident step.

GONGE Riverstones are a set of 6 multicolor, triangular stepping stones designed to enhance balance, coordination, and confidence in children aged 3 and up. Featuring non-slip rubber edges for safety and durable construction supporting up to 99.79 kg, these stones offer customizable difficulty levels and stack neatly for easy storage—perfect for dynamic indoor and outdoor play.

Specifications

ASIN	B000ANIVRG
Assembly Required	No
Batteries Included	No
Batteries Required	No
Colour	Multicolor
Country of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (1,870)
Date First Available	28 August 2012
Educational Objective(s)	Balance, Motor Skills
Generic Name	Balance Stones
Included Components	Set of 6 river stones
Item Dimensions LxWxH	35.6 x 35.6 x 8.5 Centimeters
Item Weight	2 kg 690 g
Item model number	2120
Language	English
Manufacturer	A. Winther
Manufacturer recommended age	3 years and up
Manufacturer's Suggested Maximum Weight	99.79 kg
Material Type(s)	Rubber
Model Number	2120
Net Quantity	1.0 Count
Number of Game Players	1
Number of Puzzle Pieces	6
Product Dimensions	35.56 x 35.56 x 8.51 cm; 2.69 kg
Remote Control Included?	No
tech_spec_battery_description_toys	No batteries required

Reviews

D**.

3.03.2019

M**N

17.04.2017

C**A

20.01.2020

C**N

4.07.2018

M**H

26.12.2020

M**A

20.03.2023

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¥59265

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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