PERFECT SIZING: 8.3''*4.3''*8.7'' food feeder and water dispenser can hold up to 33.8 oz water. Bowls with 4.7'' in diameter are perfect size for small animals, such as rabbit, chinchilla, guinea pig, hedgehog, and ferret. TWO WAYS TO USE: Automatic supply pets feeder and waterer can be either placed on the ground or hung on the cage. Rotary knobs allow you to hang them tightly on the cage. A flat bottom also allows them to be put on the ground, when you decide to take your pets out of the cage. AUTO-REFILL DESIGN: Pets feeder set effectively reduce the frequency of food and water refills. Gravity feeding technology does all the work for you. They dispense food and water as your pets empty the bowls. SAFE MATERIAL: These dog food dispensers are made of polypropylene, which can be washed at high temperatures. SMOOTH DELIVERY: The gravity feeder has a larger opening with a reasonable slope so that the grain can be delievered smoothly into the bowl. On the other hand, there is a twisting lock on the dog water dispenser which allows you to place the water bottle tightly, so that there won't be any leaking.