Living World Stainless Steel Cup is a multi-purpose feeding cup that can be used for birds, puppies, dwarf rabbits and other pets. Durable, long lasting and easy to clean, the cup comes complete with a metal clamp for easy installation in most cages. 850 g (30 oz).
Other sizes available :

80760 Living World Stainless Steel Cup, 567 g (20 oz), with metal clamp, medium