Petmate's Crock Bowl has extra thick walls. These crocks resist scratches & nicks. They are easy-to-clean. They come in assorted colors & sizes, so you are sure to find a bowl to fit your pet's needs! Petmate’s Nesting Crock are extra thick & chew resistant. These durable crocks resist scratches & nicks that can trap bacteria. They are easy to clean They come in 4 sizes, so you are sure to find a bowl for any size pet!