Large, strong, acrylic plastic dish. Great replacement dish for the larger HOEI and similar parrot cages, where the cup fits in a door opening. Cup measures 4 1/8 inches wide x 2 3/8 inches deep . Should fit cage doors from 4-1/4 to 4-3/4 inches wide. Older HOEI cages of this type used aluminum cups; as HOEI is no longer available in the United States this cup is made by a third party. Sterilize with Desi Natural Spray.