Engineered to ensure a proper fit on one- and two-piece toilets, this Brevia seat complements a wide variety of elongated toilet designs. This soft-close toilet seat features innovative technology that prevents noisy slamming. Unique Grip-Tight bumpers hold the seat firmly in place and prevent shifting.Features:Quiet-Close™ lid closes slowly and quietly without slamming.Grip-Tight bumpers hold seat firmly in place.Quick-Attach® hardware for fast and secure installation.Color-matched plastic hinges.Toilet seats are not returnable to Kohler Co. if opened or outside of original packaging.Dimensions: 18 in. long x 14.19 in. wide x 0.88 in. highPlasticAssembly Required.