... to start crastallization,when the crystallization completed,squeeze the hot pack to make it soft for immediate use.2.To recharge ... : place the hot pack in boiling water with cloth below,note,prevent the plastic ... sizeweight PackingQTY/20GMOQ(pcs)29cm19cm21×3×29cm0.78kg20pcs/Carton13000pcs20F×1 waist therapy