Seam-welded tubular steel frame with steel seat pan. Enamel frame. Fixed legs have polyethylene feet in Gray Adjustable height legs have 8" range in 1" increments and have self-leveling glides. Nickel plated telescoping leg section locks with set screws. 13" diameter polypropylene seat attaches to steel mounting plate which is welded to legs. Sold in carton quantities only (2 per carton). 12 seat colors and 10 frame colors. 15 year manfacturers warranty. Fixed height available in 18", 24" and 30" heights and come with Gray feet bumpers. Adjustable heights vary, see details below. Greenguard Certified.