Instant Hot Pack 1.Easy to use,can reach 43 C. ... -last about 40 minutes 2.Non-toxic,non-caustic.disposable. Instant Hot PackFunction:1.Easy to use,can reach 43 C ... to rupture.2.Shake to mix contents.Application:1.This instant hot pack can release heat within 5 seconds,conveniene to ... catching a cold.(3) Dysmenorrhea,post partum abdomen recover. Disposable Instant Hot Pack