Blood pressure management with a simple "twisting exercise." "Twisting exercise" refers to an exercise that involves repeatedly clenching, twisting, and relaxing your hands. Clenching your hands compresses the blood vessels with the arm muscles, and relaxing them releases the compressed blood vessels along with the muscles. Repeating this activates blood flow. SIXPAD's hand grip made of silicone rubber and polycarbonate, easy to use with dry cell batteries. - Brand: SIXPAD - Product Name: Health Grip - Materials: Silicone rubber, polycarbonate, ABS resin - Power Source: Dry cell battery type (uses 2 AAA alkaline batteries) - Set Contents: 1 main unit, 1 safety guide, 2 AAA alkaline batteries Thank you for viewing.