Constructed of aircraft quality aluminum and chrome-alloy steel. Very light weight, only 2 ounces. F.D.A. registered and patented. This original and unique instrument measures approximately 5 1/2″ L x 5/8″ wide at the rear tension adjustment cap and less than 3/8″ wide at the contact surface. It was designed for the Bio-Kinetics ™ process to provide gentle stimulation, and to do so without any fatigue or stress to the practitioner’s joints. Keep one with you at all times. Keep one at home and the office. Serious Bio-Kinetics ™ practitioners own several. Warranted for five years.