This is a Tradewinds Gray Resin Radial Top-Seat. It measures 56 7/8" long, 7 1/4" wide near the center (6 1/2" wide at the ends) and 3" tall. It will fit on 15', 18', 21', 24', 27', 30', & 33' round pools as well as 25'x15', 30'x15', 33'x18' & 41'x21' oval pools.