Rite Farm Products 12-ounce capacity small pet feed, water, or treat cups. We use them in our coops & cages to give birds food, water, & treats. Works well for pigeons, quail, chickens, rabbits, birds, chinchillas, ferrets, and many other small pets. Connects to all wire cages, chicken wire, and hardware cloth. 3 built in prongs hold the cup to the wire on the rear of the cup. Strong polyethylene cup is built to last. Fast removable from cages for easy cleaning. Overall dimensions are 4.75 inches long x 3.875 inches wide x 2.25 inches tall.