This white elongated toilet seat constructed from high-impact plastic features a No Slam hinge mechanisms that keeps your bathroom safe and quiet. High-grade plastic construction means stain and crack resistance. Adjustable hinges fit hole spacing from 2-1/4" to 6-1/2" and are designed for easy cleaning. Ergonomic design for maximum comfort. White Plastic Toilet Seat. Elongated Toilet Seat: Lid: 17 1/4 in. L x 13 3/4 in. W. Seat: 18 in. L x 14 1/4 in. W.