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 bag; it fits most types of water bags, including compatibility with Packs Hydraulics water bags. 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 drinking. Wide Application: Fits most water bags with various capacities; ideal replacement for cycling, running, hiking, or other outdoor activities. Color: Transparent-Red. Material: Silicone. Package Contents: 1 set x Soft water bottle spout. Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color in the image to vary slightly from the actual item. Measurement may vary by +/- 1-3 cm.