Features:
Stainless steel material is durable and easy to clean
3.4mm bore diameter standard size for many fountain pens
Easy to fill, just dip the nib section into bottled ink, press the spring stick down, release the stick to draw ink up into converter.
These converters were made durable material, plastic and stainless steel
Package include:
5* Fountain Pen Piston Converter Ink Sac