Schmidt 5888 Rollerball refill are premium rollerball refills! Your handmade pen deserves the best ink! This is a upgraded rollerball refill with metal body. These smooth-writing rollerball refills are often regarded as the best in the business! They have a ceramic tip, not steel and write very, very smoothly. The metal body of the 5888 makes the refill stiffer which translates into a better writing experience. The safety features allow for a longer cap-off life and extended shelf life.