ACME Standard Rollerball 888 Refill
- Length: 111.1mm (4.375″)
- Manufacturer’s website: ACME Studio
The ACME 888 Roller Ball is a rebranded Schmidt 888 standard ceramic rollerball (RB) with a plastic body. This refill is typically available as a 5-pack in black, blue, red, or rainbow (one each of violet, turquoise, green, orange, and pink). Numerous pen and refill makers offer substitutes for this refill.