Comes with 4 bite valve silicone sleeves, each containing an inner post. Bite valve replacement sleeves: Use these bite valves to replace old and leaking bite valves on your water reservoir; compatible with most types of hydration packs and water reservoirs, including Packs Hydraulics models. Premium silicone: Made of high-quality silicone with good durability and elasticity, odorless and free of harmful substances, providing a soft bite for easy sipping and healthy hydration. Wide application: Fits most water reservoirs of various capacities; ideal replacement for bite valves during cycling, running, hiking, or other outdoor activities. Color: Transparent-Red. Material: Silicone. Package contents: 1 set x Silicone bite valve sleeves. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the actual product. Measurement may vary by +/- 1-3 cm.