Plus Guard Your ID Stamp Roller Refill Cartridge Pop open the Guard Your ID Roller Stamp and place the refill in the compartment without any mess Each roller refill contains specially formulated oil-based ink with extra black pigment to permanently cover printed material Not for use on glossy or coated papers as oil based ink may rub off Perfect for home, office, travel, students at college and seniors Easy Drop-in Replacement for IS-500CM. Stamp Width: 1 inch (25 mm) and Stamp Length: Approximately 160 feet (48 m)