The Big John Toilet Seat has a longer opening and a luxuriously contoured sitting surface that is roomier than any other toilet seat on the market. The seat is made from the highest grade of ABS plastic which is both stain and chemical resistant. ADA Compliant 1200 lbs. Capacity -2 1/2″ Rise -Stabilizing “Synthetic Rubber Bumpers” that grip the porcelain, keeping the seat from shifting while providing excellent transfer assistance. -Fits on almost all toilets round or elongated. -Durable Stainless Steel Hinges that provide unbreakable strength where others fail. ADA compliant regulation #: 4.23 ADAAG. Meets or exceeds: ASNE.ANSI z124.5 CSA/IAPMO/UPC -seat 19”x 19” , giving you 75% more sitting area . - 2.5 “ rise - stainless steel hinges