warm pack,hot pad,hand warmer,heat pack Reusable (in PVC packaging, 1 color) warm pack,hot pad,hand warmer,heat packthere is a metal disc inside,flex it.the liquid will crystal and turn out heat.when it cool down,put into the boiling water until all crystal disapper. Item no.SizeWeightPackingQty Per Container(20")MAG405713x19cm220g/pc48pcs/carton2048ctnsMAG40459x13cm173g/pc48pcs/carton2198ctns