Full MIG welded frame-inside and outside of the brackets with connected welds. No penetration through the seat surface. Features steel lower back support, molded K-Resin seat with vented back, reinforced ribbing in back and under seat for strength, 14 gauge non-tapered steel legs. Also features SuperGlide™ composite ball glides, 70% polypropylene and 30% nylon, for durability and protection on hard floors and carpet. Availabe in red, blue, yellow or green. UPS OS2 delivery.