Tronixpro 72mm Pro Series Snap On Lens Cap For Canon EF 50mm f/1.2L USM Lens, Canon EF 85mm f/1.2L II USM Lens, Canon EF 35mm f/1.4L 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 72mm Snap On Lens Cap