... inner ring outer coarse, crude 2MM, galvanized surface,Tripod and handle galvanized processing.2,packing1) Color box size 28*17 ... temperature resistant enamel surface treatment, chrome grill net, safety and health.3)[Ice pack material] (600D ice pack material ... , temperature effect of the package ( with warm in winter and cool in summer. ), multipurpose cold insulation, insulation, preservation, ...