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 hydration bladders, including Packs Hydraulics models. Premium Silicone: Made from high-quality silicone, offering durability, elasticity, and resistance to odors. Free from harmful substances. Provides a soft, comfortable bite for easy sipping and healthy hydration. 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: This package includes only the items listed. Other products are not included. Note: Color may vary slightly due to lighting and monitor display differences. Size may vary by +/- 1-3 cm due to manual measurement.