This bite valve is made of soft and durable silicone, BPA-free, safe and non-toxic, with a stainless steel bite valve, durable and not easy to break. The bite valve is easy to clean, just rinse it with water or put it in your drinking water bag and close the water bag mouth, and then turn it upside down or shake it gently. This bite valve is designed for quick and easy hydration, allowing you to control the flow of water with one hand. The bite valve cover can effectively prevent foreign objects from entering the water bag, keeping the water clean and hygienic. This bite valve is suitable for most hydration packs and water bags on the market. The package includes 2 pieces of bite valves with covers.