this massage hammer have the dolphin style,it can massage evey position you want.it has the magnetic massage head and far infrared ray . it has the function as below 1.alleviate pains by fatigue or rheumatism. 2.alleviate the spasm in the shoulder caused by the stiff neck when sleep. 3.relax the muscle and eliminate the pains caused by the tense sport. 4.lose weight partly . product dimension :43.5x15x11.3 cm N.W 1.5kg packing :20pcs/carton 76x46x56cm