Flexible Silicone Build: Made from strong, food grade silicone, these pieces form a consistent seal for daily use, sports, or outdoor activities, liquid spills effectively Complete Replacement Set: Includes 10 silicone sealing o-rings, suitable for 15oz bottles and glasses, providing spares to maintain your drinkware's functionality over time Precise Size Measurement: Each piece is approximately 7x7cm/2.76x2.76in, fitting securely on 15oz containers to preserve beverage temperature and leaks Verified Compatibility: Designed to work with 15oz bottles and glasses; confirm your container model before purchase for correct fit and operations Easy Installation approach: Simply remove the old or damaged piece and insert a new silicone seal for a repair without needing special tools