The Benu Fountain Pen Ink Converter is a refillable cartridge system designed to let you use bottled fountain pen ink instead of disposable ink cartridges in compatible Benu fountain pens.
Here are the main details:
Type: Standard international ink converter (fits most Benu pens that accept standard international cartridges)
Material: Usually clear plastic body with a metal or plastic twisting mechanism
Capacity: About 0.6–0.8 ml of ink (varies slightly by model)
Function: Works by twisting the piston to draw ink up into the converter directly from an ink bottle
Compatibility: Fits most Benu fountain pens except models designed exclusively for cartridges
