Parents and children love this convenient, innovatively designed toilet seat created for enhancing the potty training experience of your child. This seat can be used by both children and adults! a magnetic closure gently secures the built-in potty seat into its compartment in the seat lid until it is flipped down for use. The hinges are state-of-the-art slow close chromed metal. The hinges close the lid and ring quietly and gently. The lid and the ring are both white. This particular 6TSTR9999SL 000 fits round bowls which measure 16. 5 inches from hinge holes to end of the inside of bowl. Installation hardware included. See size and installation diagrams above. Three-year .