Schneider Fountain Pen Ink Cartridge, Box of 6, Black (06601) Schneider is a leading international brand, with writing instruments designed and engineered in Germany, distributed in the US exclusively by Stride, Inc. Fountain pen cartridge for easy use; Black ink; box of 6 cartridges Compatible with Schneider and many other fountain pens and cartridge rollers Standard format ink cartridge with ball closure International sized ink cartridge; overall size: 1-1/2" x 1/4" (40mm x 6mm)