Polarized Clip-on Flip-up Plastic Sunglasses - Square - 60mm Wide X 54mm High (136mm Wide) - Polarized Brown Lenses - Shade Control G-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