Sea Horse Toilet Seats: Made of High Grade Polymer this seat is designed for maximum strength and durability and does NOT yellow over time like most polymers. Fits over standard size toilet bowls and comes in a variety of designs. Cast within the seat the stabilizing bumpers prevent rocking and keep the seat safely in place. Solid brass PVD swivel hinges are easily adjustable 3 5/8 in. to 7 1/2 in. and easier to clean. Physical Vapor Deposition protects brass hinges from tarnishing for years to come. Seat measures: 15 13/16 in. x 14 9/16 in. Lid measures: 14 5/16 in. x 13 1/8 in. Round shape.