1.PVC & MESH; High density foam 2.Locking tilt mechanism with tilt tension adjusts 3.50 mm Dual Wheel nylon caster Office chairProduct specification PVC & MESH;High density foam ; PP & chrome armrest ;Locking tilt mechanism with tilt tension adjusts and locks at upright position ;Gas lift 10cm;350mm Chrome base with easy -moved castors ;50 mm Dual Wheel nylon casterMeets or exceeds ANSI/BIFMA X5. ...