TOTO Soiree SoftClose Non Slamming, 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 to reduce injury and to eliminate annoying "Toilet Seat Slam." 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 Soiree and Eco Soiree toilets, 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. All mounting and installation hardware for the SoftClose seat is included, along.