Sheaffer Piston Converter for Sheaffer Fountain Pens (86700), fits Prelude, Sagaris, Intensity, 300, and 100 fountain pens Compatible with the following Sheaffer fountain pens: Prelude, Sagaris, Intensity, 300, and 100 Enables the use of bottled ink in place of fountain pen ink cartridges For use with authentic Sheaffer Bottled Ink