Perfect for that aching neck, the 5 Stone Neck Pack, patented by designer Fred Harrison of Stonehenge, consists of five smooth flat stones connected in series by a pair of coated bronze wires. When heated, it provides pressure and heat to the back and sides of the neck, causing a relaxation that can be felt immediately. It can also be refrigerated for cold therapy. Instructions: Soak the device in hot tap water, or water warmed through other means. Test the heated moist stones by touch the stone to the inside of your wrist. Let cool if too hot. Place the device where it is needed. Relax and let the heat and pressure help work the kinks out.