Material question: A bowl is just a bowl, right? Sadly, this is not the case. Most pet food bowls are made of stainless steel, plastic, or ceramic. Plastic is the worst choice, containing chemicals that can disrupt an animal's hormonal balance. On top of that, plastic can accumulate deep scratches, harbor unhygienic stuff and be difficult to clean. Ceramic is heavier and much less durable. A drop or impact can chip, crack, or shatter your ceramic bowl, making it no longer safe to use. Anti-Rust Rubber BottomMade of real stainless steel. If properly cared for, your stainless steel dog bowl will last for many years. Regular metal bowls try to pass off as stainless steel when they are actually regular steel (carbon steel) and will rust quickly. The added non-slip rubber edge at the bottom prevents the bowl from sliding and reduces noise when your dog eats. Easy to Clean and Dishwasher SafeThe dog bowl made of stainless steel can be easily cleaned with mild dishwashing soap and warm water. Plus, they're dishwasher safe for easy cleaning. Additionally, the rubber ring can be removed to wash these bowls thoroughly in the dishwasher. Stackable Design for Convenient Storage or TravelWith a thoughtful and convenient design, these bowls can be easily stacked together for convenient storage or travel. Durable for long-lasting use and healthy for your beloved four-pawed companion. SIZE : CAPACITYSize: Each bowl holds 1.5 cups/12 fl oz (5.3" diameter x 1.9" height)