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JJC body cap and rear lens cap kit contains both a body cap and rear lens cap for camera bodies and lenses. The body cap fits onto the camera's lens mount to protect the camera's sensor from dust and damage when a lens is not mounted. The rear lens cap is placed on the rear mount of your lens when the lens is not in use on your camera. It protects the rear glass element and electronic contacts from scratches, dust, water, and fingerprints.