Complete Compatibility: Specifically designed for FreeSip bottles in sizes 19, 24, 32, and 40 ounces ensures a perfect fit. Superior Materials: Constructed using high-grade silicone for the stoppers and robust plastic for the buttons, this set prioritizes health with materials. Tested durability ensures prolonged use and reliability, maintaining the integrity of your beverage container. Practical and Essential: Perfectly prevents leaks with precisely fitting silicone stoppers and responsive buttons. This kit ensures your FreeSip bottle maintains its convenience and usability, making it essential for daily hydration needs. Note: The physical slightly color difference or difference, does not affect the use of Colour:Black Material:Silicone+Plastics Package Contents: 2x replacement buttons 2x additional springs 1x screwdriver 2x Stopper Replacement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.