Food-grade safety material: High-Density Polyethylene.Safe and non-toxic, hence it can safely be used for pets.BPA Free, no smell, soft material, and recyclable.The various parts are detachable and easy to clean.Capacity Tick Mark. (It is convenient for you to provide your pet with the appropriate amount of water according to his/her drinking needs.)To improve the waterproof function, we added a waterproof lock on the bottle cap. Convenient for you to feed your pet, do not worry about water leakage. It won't get your travel pack wet. No water waste. This is because it has a built-in water pipe.Note: Please confirm the cleanliness and sanitation of drinking water before filling the water to avoid the harm caused by drinking unclean water to your pet's health.