Straight from the horse's mouth - A single sheet of vacuum-formed ABS plastic forms the base of our Banana seat, and is covered with molded urethane foam. The tuck n' roll cover is hand stitched, heavy-duty vinyl, then glued and stapled to the underside of the pan. A laser-cut and hand polished, stainless-steel bracket riveted to the rear underside of the pan mounts securely to the top of the rear fender with one, supplied 5/16-18 hex bolt and acorn nut. 

These seats fit 86-03 Sportsters and only need one hole drilled on your fender to get them right. Great seat. Get one!