FOR STANDARD FOUNTAIN PENS: Refill cartridges for everyone who likes to write with fountain pens or rollerballs, compatible with all common standard fountain pens and rollerball systems BOX OF INK CARTRIDGES: 6x standard cartridges. Refill cartridges for home, school or the office. Cartridge length 3.8 cm QUALITY: ONLINE ink is of high quality and convinces with a constant colour tone and a smooth writing experience. Made in Austria PREMIUM INK: Intense shades available in various bright colours ONLINE brand quality: ONLINE has been a German company since 1991 and specializes in writing implements, calligraphy sets, cases and much more PACKAGING MAY VARY