... diameter, outer coarse2.4MM, chrome-plated surface, the inner net crude 2MM,23CM,2.4MM inner ring outer coarse, crude ... rolled plate, high temperature resistant enamel surface treatment, chrome grill net, safety and health.3)[Ice pack material] (600D ice pack ... type PVC ( inner layer )4)[ introduction ] ice packHeat preservation bag, ice bag is also called passive refrigerator, is a kind of high ...