Kaytee Flat Bac Water Bottle Made of durable clear plastic with a floating duck inserted as a friendly refill reminder Stainless steel spring-loaded dripless sipper Snap-lock Bottle Bracket with the convenient E-Z twist attachment knob allow for effortless bottle removal and refilling Easily adapts for use either inside or on the outside of the cage Large 16 oz. size is ideal for guinea pigs, dwarf rabbits, pet rats, and chinchillas