A clean, sanitary bottle helps your pet stay hydrated while keeping their cage dry and spill-free. Based on the size, it is perfect for birds, hamsters, gerbils, guinea pigs, rabbits, chinchillas, ferrets and others. Designed with a special no-leak vacuum action for superior performance. The one piece tube and cap assembly provide a protected water supply, reducing the risk of contamination.. One Piece Tube And Cap Assembly With A Stainless Steel Double Ball Point Tube: Size: 4 OUNCES