Living World feeders and water cups come in a variety of sizes and colours. The colour will vary between white, yellow or purple. All have been carefully designed to meet the specific feeding and drinking habits of pet birds. They can be used as primary sources for food and water or as extra cups to feed treats and supplements. The Living World Seed Cup with metal hooks is suitable for parrot cages. Living World Seed Cup, 55 g (2 oz), Small, 6 x 7.5 cm (2.4 x 2.75 in) Living World Seed Cup, 112 g (4 oz), Medium, 9 x 8 cm (3.5 x 3 in) Living World Seed Cup, 140 g (5 oz), Large, 12 x 8.5 cm (5 x 3.5 in)