Hi! What is the capacity of the standard long Waterman cartridges in ml?

The long cartridges are 72 mm in length with about 1.45 ml capacity.

This fits all Waterman pens, so what's the difference from standard so110850 Waterman cartridges, much cheaper?

This did NOT fit my Waterman pen. It was too long. So I'm afraid I can't answer your question properly. Sorry.

Would the cartridges fit in this fountain pen https://www.amazon.com/fountain-ideapool-calligraphy-signature-executive/dp/b01m1fuxun/ref=pd_sim_229_5?

I'm not sure but I don't think so. They look different

Does these fit pilot pens

Most likely not. I believe they are brand specific. These are very large tubes that fit the waterman nicely. there are smaller tubes S0194751 by Rotring that I have purchased on Amazon. They come at a very low cost with many units and work great for smaller reservoir pens. The pack is 6 per box and you can buy multiple boxes at one time to save more money. If you use your fountain pen a lot that would be my recommendation.

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WATERMAN Ink Refill Cartridges for Fountain Pens, Black, 8-Pack (S0712991)

Product ID: 145330908

Details

Brand
Waterman
Item Weight
0.22 Grams
Item dimensions L x W x H
7.7 x 6 x 1.2
Number of Pieces
8
Style
Fountain

¥7725

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Description

Waterman - Refill Cartridges for Fountain Pens, Black Ink, 8/Pack - Sold As 1 PackSmooth flowing ink adds to the sophisticated writing experience. Easy to replace refill offers mess-free cartridge changing. Waterman demands exacting manufacturing standards so you can expect consistent, flawless ink delivery. Pen Refill Type: Fountain; Special Ink Type: N/A; Refill For Series: Cartridge Refills For Waterman Fountain Pen; Tip Type: N/A.Smooth flowing ink.Easy to replace; mess-free.Exacting manufacturing standards; consistent, flawless ink delivery.

Specifications

ASIN	B000J3X9XS
Best Sellers Rank	#106,886 in Office Products ( See Top 100 in Office Products ) #2,684 in Inkjet Printer Ink Cartridges #18,124 in Pens & Refills
Brand Name	Waterman
Customer Reviews	4.6 4.6 out of 5 stars (1,508)
Ink Colour	Black
Item Dimensions	7.7 x 6 x 1.2 Centimeters
Item Weight	0.22 Grams
Manufacturer	Waterman
Manufacturer Part Number	S0712991
Model number	S0712991
Number of Pieces	8
Package Size Name	8 Count
Style Name	Fountain
UPC	844998178613
Unit Count	8.0 Count
Warranty Description	no warranty available

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¥7725

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.

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