... , professional heat dissipation design2, high quality universal wheel with brake function3, with high quality interface4, Telecommunication level PDU power ... fan,professional heat dissipation design Armrest :high quality rubber armrest2,Wheel :,high quality universal wheel with brake function;no ... over 15 years experience; 2. cold roll steel of high-class used, firm and durable; 3. ISO9001 & ISO14001 ...