Polycarbonate Clip-on Flip-up Canary Yellow Enhancing Driving Glasses - Lo Oval - 55mm Wide X 35mm High (120mm Wide) - Shade Control D-Clips 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