About YR Brand: YR is dedicated to providing buyers with high quality products and premium service.Please feel free to contact our customer service if there's any problem. Specification: Size: 1.3 x 0.6 x 0.1 inches Weight: 1.2 g Material:Silicone Color: Black Cleaning way: Wash them with soap and water.Air-dry is perfect! USAGE TIPS: If is difficult to puton them to your glasses, please heat for 30 seconds with hot water to loosen. Youcan also use some lubricant like hand cream to thread on your glasses. PackageContents: 5 Pairs of Silicone Ear Hook Sleeve Retainers Warranty: 3 months money back guarantee. Please fell free to contact us if you have any questions.