Tronixpro 77mm Pro Series Snap On Lens Cap For Canon EF 70-200mm f/2.8L IS II USM Lens, Canon EF-S 10-22mm f/3.5-4.5 USM Lens, Canon EF 100-400mm f/4.5-5.6L IS USM Lens This lens cap protects lens surface from dust & shock during storage. Unique snap on design allows easy installation onto the lens & one-step removal from the lens. It fits directly onto the lens with a double-action spring design. Microfiber Cloth 77mm Snap On Lens Cap