Toto SS114 Features: Elongated toilet seat with lid "“ designed to complement a wide variety of elongated toilet designs Made from heavy duty solid plastic, easy to clean and chemical resistant Seat is ergonomically contoured to provide maximum comfort to the user Secure mounting assembly while keeping installation fast and easy Complete with integrally molded, permanent color-matched plastic hinges Toto SS114 Specifications: Overall Length: 18-1/2" (measured from the back of the hinges to the front most part of the seat) Overall Width: 14" (measured from left most point to the right most point on the seat) Distance Required Between Installation Holes: 5-1/2" Made from molded polypropylene Soft Close: Yes