... Easy to use,can reach 43 C. long tiem hot-last about 40 minutes 2.Non-toxic,non-caustic.disposable ... .Instant Hot Pack Function:1.Easy to use,can reach 43 ... C. long tiem hot-last about 40 minutes,2.Non-toxic,non-caustic. ... .2.Shake to mix contents.Application:1.This instant hot pack can release heat within 5 seconds,conveniene to ...