This seat has solft and durable marine grade, UV protected and mildew resistant vinyl combined with long-lasting high density foam padding, * The durable PVC base mounts to any standard pedestal, and includes stainless steel hardware. Swivel not included * Dimensions: 5-3/4-Inch H x 15-1/2-Inch W x 10-3/4-Inch D * 1-yr. limited warranty