Shade Control D-clips Polycarbonate Clip on Flip up Canary Yellow Enhancing - Oval - 54mm Wide X 39mm High New lower profile squeeze to open clip New leg profile to fit both metal and plastic frames All metal alloy construction - virtually unbreakable clip mechanism Legs have proprietary coating to protect ophthalmic lenses and prevent shifting and scratching Convenient one hand application to Prescription frames with positive indexing lens positions