Comes with 4 bite valve silicone sleeves, each containing an inner post. Bite Valve Replacement Sleeves: Replace old or leaking bite valves on your hydration bladder; compatible with most types of water bags, including Packs Hydraulics hydration bladders. Premium Silicone: Made from high-quality silicone, offering durability, elasticity, and resistance to odors; free from harmful substances for a safe and comfortable drinking experience. Wide Application: Fits most hydration bladders of various capacities; ideal for cycling, running, hiking, and other outdoor activities. Color: Transparent-Red Material: Silicone Package Contents: 1 set * Soft water bottle spout Note: Items shown in the image, other accessories not included. Note: Color may vary slightly due to lighting and display settings. Measurement may vary by +/- 1-3 cm.