The full size PROFESSIONAL THUMPER is ideal for 2 person use (eg. doctor - patient). A full-body Thumper massage takes only about 5 minutes, leaving the patient completely relaxed. It has 8 massage spheres and pulses 27 times per second. Its large size allows you to massage both thighs, calves, feet or paraspinal muscles at once. It weighs 7 pounds (3.2kg) which provides all the necessary force to provide a sensational massage! There is no pressing and prodding. Just park it on the muscle area of choice and relax. And for all of you professionals who have tired hands of using massagers all day on your patients, the Thumper has no kickback in the handles.