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