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 problems. Specification: Size: 2 X 0.2 X0.2 inches Weight: 1.2 g Material: Silicone Color: Black, Clear USAGE TIPS: If is difficult to put on them to your glasses, please heat for 30 seconds with hot water to loosen. You can alsouse some lubricant like hand cream to thread on your glasses. Package Contents: 10 Pairs of Silicone Sleeve Retainers (5Black,5Clear) Warranty: 3 months money back guarantee. Please feel free to contact us if you have any questions.