quality: Premium ink converter for standard fountain pen and rollerball systems. If your pen accepts standard ink cartriges, the ONLINE converter will fit perfectly. VOLUME: The converter has a filling volume of two standard ink cartriges. Save money, avoid rubbish, and protect the environment by refilling your ink pen using bottled ink. CLEAN DESIGN: The converter is made of plastic in crystal clear design. Thanks to the sturdy frame, this converter is made for multiple use. STANDARD SIZE: Dimensions: 70 x 8 x 8 mm - universal size for standard fountain pens! ONLINE BRAND QUALITY: ONLINE is a German company founded in 1991 and specialises in pens, calligraphy kits, pen cases and much more. ONLINE offers quality only!