Evideco 4101130 Designed Toilet Seat, Oval/Elongated, Red 100% medium density fiberboard This toilet seat is in medium-density fiberboard (MDF). This standard size toilet seat has adjustable color coordinated plastic hinges (3 positions) and is easy to install with the included hardware. CHECK CAREFULLY THE SIZE NEEDED , this toilet seat is 17.5"L X 14.75"W Made of MDF (wood), comfortable with 4 bumpers Adjustable color coordinated plastic hinges (3 positions= 3 possible lengths) Elongated toilet seat, fits mainly toilet bowls