PP armrest , tilting mechanism, 320mm nylon base & pu castor. 5271-C hot sales office chair, executive mesh chair:1)PP armrest , 2)tilting mechanism, 3)320mm nylon base & pu castor.4)Packing size: 56x34x55cm, One 40'HQ can be load 650pcs 5)Warranty period: 3 years 5271-C hot sales office chair