ACME Rollerball Refills (888 "F"), come in a pack of 5 refills, in either black, blue, red or rainbow (5 colours). Each refill is packaged in a sealed plastic sleeve, which is packaged in a black ACME refill box. Works for all ACME Standard Rollerball pens.

ACME Rollerball refill also available as 5888 in metal tube.