firm and stable for us to use, no deformation and has a long service life. Protect your delicate lens dirt, and scratches. The purpose of rear lens is to keep dirt, fingerprints, and off your lens after you removed the lens from cameraThis rear len is used when storing your lens or after the lens has been removed from your camera Feature: lens is high metal This easy to attach rear lens gives sturdy for for the rear contacts lenses when not in use.