... temp:63.C 3.Heat duration time: 8hs 4.Mini heating pad (Mini )body warmer pad With CE, SGS,ISO and ... .Net weightShelf lifePacking90mm*70mm8 hours63°C 53°C20g3years480 pcs /cartonMaterial: Iron Powder, Water, Vermiculite, Activated Carbon, Salt,Absorbent polymer resin and ... reqirement,the warmer pad may have different size,shape,and heating duration time.