Check the listing for details. 6Pair Silicone Eyeglasses Retainer for Eyeglasses, Black. Color: Black, Condition: New, Made in CN. Listed at 19.81 USD. Silicone eyeglasses retainer is an accessory used to help fix glasses. They can hold glasses in place and prevent them from slipping while you are doing daily activities. It allows you to use it in the office, at home, outdoors place for work, running, studying, playing ball, fitness, etc. Silicone eyeglasses retainer can also be used to fix other glasses, such as sports glasses and sunglasses.SpecificationMaterial: SiliconeColor: BlackSmall Size: 25 x 15.7mm / 0.98 x 0.62 inch ( L * W )Hole Size: 5.5 x 3.3mm / 0.22 x 0.13 inch ( L * W )Style: Ear HookPacking List: 6 x Silicone Eyeglasses RetainerAdvantageSilicone material is soft, elastic, non-slip and durable, not easy to oxidize, soft and comfortable to wear, long service life.