Genuine Canon rubber mount ring for the EF-S 10-22 3.5-4.5 USM, EF-S 18-55 3.5-5.6 II, EF-S 18-55 3.5-5.6 IS , EF-S 18-55 3.5-5.6 DC, EF-S 18-55 3.5-5.6 USM and EF-S 18-55 3.5-5.6 II USM lenses. This is the rubber ring at the back of the lens. Package of 1 rubber ring. Made by Canon Taiwan.