▻Microfiber / leather fabric ▻High density sponge ▻Auto tilting chassis with 4 gear locking function ▻Backrest adjustment angle 93 ° ~ 119 ° ▻Stage 3 SGS certified steam rod ▻ ¢ 700MM alloy feet bearing 1134KGS, tested by American ANSI BIFMA ▻SGS test certification for PU casters, 200,000 times of friction without damage ▻ Packing of executive chair: 1 piece / 2 boxes, 0.304m3 / pcs, G.W: 31kg / pcs Packing for middle-class chairs: 1 piece / 2 boxes, 0.218m3 / pcs, G.W: 29kg / pcs