High quality gas lift, low back nylon pp made with good quality mesh fabric, Tilt and Locked mechanism, High Quality Original Stainless Steel Base.. Nylon caster, nylon mixed armrest, seat also adjustable.. Its a very reliable chair.High Quality China mesh Fabric.Breathable meshCurved backrest designHigh density sponge seat Body linked armrest conceptHigh quality chrome finishing leg5pcs PVC 2"wheelAdjustable chair height2.5 High quality Mechanism. Max holding 100kglyear gaslift and mechanism replace warranty