Roller ball style refills are available for most kits pens & popular pens. We stock the most popular roller refill which is the Schmidt 888 & 5888. Stocking Schmidt USA reseller , so you are always getting fresh refills. Available in BLACK or BLUE. FINE, MEDIUM or BROAD tips. A replacement cartridge for this reilff is available in a Gel from Pilot, the G2 in Black or Blue, fine & broad. Check out our BULK pricing and save!