UV-resistant, marine-grade vinyl standard and innovative design in every chair package, meeting and exceeding H-31 specifications. All rotationally molded seat packages include durable, black, injection molded, mounting platers for use with any slider or swivel that has a standard marine mounting hole pattern. Many other unfinished helm seat designs are also available from Moeller on a supplemental CD. Narrow Standard Seat for Tight Applications. Replacement Parts are also available: ST2050-HD: White 2050 Chair Only -CU1050-2D: White 2050 Cushion Set Product Dimension: 15.25D x 16.50W x 15.25H