The Fotodiox designer lens cap set is specifically made for all Canon EOS EF-EF S mount compatible camera bodies and lenses. The easy to attach caps give sturdy protection for the rear contacts of lenses and interior mechanics of bodies when not in use. They fit tight and securely on the lens or body by a simple twist. The caps are made of high quality ABS material, which will last for long time. Choice of 9 different colors for you to add flair, color code and or organize your gear.