The Vannon 16oz BPA Free Cage Water Bottles are perfect for small animals. With a capacity of 16 fluid ounces, these bottles are large enough to provide your pets with plenty of water throughout the day. The water comes out automatically under the force of gravity, making it easy to change without having to stand up and tip the bottle. The bottles are made of high-quality PP material that is non-toxic and has no strange smell. All of the stainless steel fixing screws are used to prevent rust of the surface after long-term use or in a wet environment. The barrels are also removable for easy cleaning.