They are made of high-grade materials, high quality hinges and fold up smoothly. We design premium and high-end sunglasses at an affordable price. Polarized lenses offer 100% UV protection, including UVA, UVB, and UV400 allows for better and brighter vision without eyestrain. Just fold in half the frame. It becomes a bracelet. Slap it around your wrist or steering wheel, bike handlebars bag or purse. Over 1000pcs, the price is based on door to door sea shipment + express.