Flat-Bac 8oz Water Bottle is a premium quality bottle with a smooth flat surface that fits tightly against your pets cage. Snap Lock Bottle Bracket easily attaches to the cage and the contoured bottle snaps into a secure position. 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. Medium 8oz size is ideal for hamsters gerbils and mice.