Gel Instant Heat Pack 1.Easy to use,can reach 43 ... -last about 40 minutes 2.Non-toxic,non-caustic.disposable. Gel Instant Heat Pack Function:1.Easy to use,can reach ... .Appilcation range:(1) Pain,toma,swelling caused by rheumatism.arthritis.acne.fatigue.etc.(2) Diarrhea,bellyache etc after catching a cold ...