The Body Cap For Sony NEX Cameras from Dot Line is a spare or replacement body cap for Sony E-mount NEX camera bodies. It is a black plastic cap that twists onto the lens mount of the camera. A body cap protects the camera's sensor and interior from dust and damage when stored and/or without a lens in place. Finger-grip edges aid in placement and removal. Having an extra body cap is a good idea in case the original gets lost on vacation or assignment.