Biltwell Inc.'s Slimline seat is constructed of a heavy gauge stamped steel pan with high rear kick for added support Stamped-in ridges on the pan increase stiffness and give the pan a clean, classic look Matte black electroplated finish The foam is molded polyurethane, approximately 1" thick A unique adjustable carriage bolt system on the underside of the seat pan allows you to fine tune the location of the seat hinge and both springs This is especially helpful if you are installing Biltwell Inc. Slimline seat on a frame with pre-existing spring bungs welded onto the rear cross member This is not a bolt-on product Available in Diamond Stitch, Tuck & Roll, Smooth, or Uncovered