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 with excellent durability and elasticity. Odorless and free of harmful substances, providing a soft bite for easy sipping and healthy hydration. Wide Application: Fits most hydration bladders of various capacities. Ideal replacement for cycling, running, hiking, and other outdoor activities. Color: Transparent-Red Material: Silicone Package Contents: 1 set * Soft water bottle spout Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.