Martial Arts Double Bullet design for hands strike exercises. There are four device weights: heavy, extra heavy, heavy duty and extreme. Go to Sizes Chart to see all device sizes. Start exercises by slow motions and after warm up, to prevent muscles and joints injury. Martial Arts Practice Stand will add more control to you practice by visualize a contact point with a target, pass, direction and extending through a target. Go to Martial Arts Practice Stand page for more information.