Stacking Chairs (Set of 4) - BlackErgonomic Backrest: Curved design supports the natural spine alignment for enhanced comfort during extended use Durable Construction: Injection molded polypropylene with fiberglass reinforcement ensures strength and longevity Stable Tripod Base: High grade 11mm solid steel frame with arch structure provides reliable load bearing capacity up to 180KG Easy to Move: Hollow seat plate enables convenient handheld transport and compact stacking Secure