Cats Rule Tom's Bowl, Amethyst It has a very hard, non-porous surface so it is difficult to scratch. It is comparable to ceramic, glass or steel in terms of food safety. Our material has been tested and approved for food safety contact for pets and humans. This bowl is not recommended for use in the dishwasher. Tom's Bowl measures 3 high, and is a 5 round. It weighs about .7 lb. and comfortably holds a small or medium can of wet food, a cup of dry food and is excellent for water too.