Made in the USA or Imported Al-Mg Metal frame Tri Acetate Cellulose lens Polarized UV Protection Coating coating Lens width: 55 millimeters Lens height: 1.5 inches Bridge: 16.7 millimeters Arm: 145 millimeters Perfect polarized lenses - Bircen polarized sunglasses would block 100% UV rays,help reduce glare caused by reflected light and improve your vision and eye comfort. Al-Mg Metal Frame-strong and lightweight. you can barely feel them on your face,but they're durable,suitable for driving,running,hiking,golf,fishing and other outdoor sports enthusiasts. Spring hinge - provide all the flexibility as you want,allow the temples to extend beyond 30-degree range of motion.Protect glasses from bending or breaking. Non-slip nose pad - selected high-quality imported soft silicone material to prevent glasses from slipping during work or exercise.Make it comfortable to wear,relieve pain or discomfort. Guarantee - all Bircen customers will receive a 30 day no reason refund service. If for some reason the purchase is not satisfactory, the customer can return the product and receive a refund.