... 9001:2008 2.Structure:conveyor system; 3.type:air-cooled motorized roller. Electric Roller Features:1.Plastic color roller has good ... .Size and color are available.5.Prompt delivery6.No swelling.no cracking, no falling chips, and no degumming Excellent resistance against oil, acid-base ... conveyor:Free roller,Powered roller,Taper roller,ect Belt Conveyor Motorized Pulley