The Camera Body Cap for Nikon F Mount Cameras from OP/TECH is one of those small, but very important accessories that you should never be without. When your camera is stored without a lens mounted to it, this body cap protects the internal parts. A thermoplastic rubber seal forms a friction fit that locks out dust and moisture that's extremely harmful to your camera. The main portion of the body cap is made from a durable polycarbonate material.