Pass Test ANSI/BIFMA X5.1-2002 Our banquet chairs are made from high quality resin with metal inserted to reinforce the firmness. Patent-pending for structural design. The newly-designed structure, avoids the flaw of forth-back wobble of the present chivari chairs. All our seat cushions have a zipper for quick and less-costly cleaning. UV protected to prevent fading discoloration, suitable for outdoor events. We added Velcro straps so each cushion stays with it's chair and thus prevents loss. Stackable chairs provide for better warehouse management and more efficient delivery. Ideal for both indoor and outdoor use.