TOTO® Guinevere® SoftClose® Slow Close Elongated Toilet Seat and Lid, is the latest in innovative smart seat technology. Constructed of solid, High-Impact Plastic, this unique seat is specifically designed for a gentle, softer close. The seat and lid utilize a built-in SoftClose® hinge system, which lowers the seat and lid down to the bowl gently and quietly. This seat is designed to match the TOTO® Guinevere® toilet, but would also complement other TOTO® elongated toilets as well as other brands of elongated toilets.The engineering of SoftClose® incorporates TOTO’s high standard of quality and consumer ease. Top tightening mounting bolts ensure easy installation (THU651N sold separately). Standard mounting and installation hardware for the SoftClose® seat is included, along with easy to follow installation instructions and care and maintenance guidelines.