OopsMi specializes in the development and production of clip on sunglasses. All of OopsMi's products have a common goal : To give your eyes a perfect care. to see this beautiful world more clearly. Product Features : ✔ Clip-On sunglasses: this is Hexagonal Shape clip on sunglasses fit it over prescription eyeglasses or readers, this model can also fit over small rounded glasses frames, easy to use for glasses wearers, you need just clip and attach onto your glasses frames or readers, flip the lenses up if you don't need this shades temporarily; ✔ TAC Polarized Lenses: TAC lens is thinner than ordinary PC or AC lenses,about 0.74mm thickness but durable and flexible than ordinary PC or AC lenses,normal sunglasses lens can only reduce sun lighting, but polarized lens can reduce the glare from sunlight, especially glare from surface of road, lakes and glass wall; ✔ UV-400 Lens: 100% UV protection and anti-glare from sun light, to protect your eyes always. Product Specifications : ➤ Clip Material : Metal & TR90 plastic ; ➤ Lens Material : UV400 TAC polarized ; ➤ Each Lens Size : 60mm X 51mm . How To Select Suitable Clip-on Sunglasses: ➤ Measure the height and width of your glasses frame. ➤ Compare the measured data to the clip data and select the clip which is a little bigger than the glasses.Please Note : * Do Not View the Sun Directly ; * Do Not Use it Driving in Very Dark Places or in the Night ; * Due to light and monitors effect, color difference may exist. Hope you can understand it . OopsMi Clip-on Sunglasses : * Friendly customer service ; * Sold and fulfilled by Amazon - Customer Satisfaction Guaranteed .