Product Information Product Name: Neck Hot Model Number: HDL-HOTM-GY Color: Gray Weight: Approximately 150g-160g Size: Inner diameter 95-100mm Main Materials... Body: TPU, Sodium Acetate, Copper Plate Cover: 100% Polyester This is new and unused. Since it has not been opened, the operation has not been confirmed. There are several available, so if you are interested in purchasing multiple, please comment in the comment section.