Specification . Seat and backrest made of blow-molded high-density polyethylene plastic . Adjustable legs with outward angles to prevent accidental overturning . Extra-large rubber tips for safety . Heavy-duty frame made of anodized aluminum tubing, extra-wide base for good stability . Adjust seat height 14" -18" (36cm to 46cm) . Seat size 20" x 12" (51cm x 30.5cm)