Phoenixx Fan Back Folding Chair Color: White (6pcs Set) Large rivets for enhanced strength Seat & Back with 100% virgin polypropylene Frame: 3/4 X 1.15mmT & 5/8 X 0.9mmT Steel Tube, Finish with Powder Coating 100% Made In Taiwan We have full laboratory drop test data to show that, under 300lbs 6 inch drop test, the chair has much better strength than most of the leading suppliers.