... parthritis, frozen shoulder, low back pain, rheumatism and rheumatoid,hand/feet cold, pain caused by injured area meeting cold ... warm , promote the human microcirculation, decrease swelling,stop pain for hand & feet frostbite, bone, muscle damage symptoms. 4, promoted the ... not directly affixed to the skin (muscle paste-type exception,hand warmer can use directly without attach). 2, the maximum heating ...