Martial Arts Bullet designed to develop, improve and maintain Martial Arts athletic skills and technique. There are three device weights (light, heavy, extra heavy) and four length (short, medium, long, extra long). Go to Sizes Chart to see all device sizes and lengths. Martial Arts Strike Extender, seen on the video above, will help to visualize a target and a device control in a time of action. Do not enforce preparation by starting to practice with a heavy or extra heavy device weight. The better way is to start practicing with a light device weight, improve an athletic skills, technique and go to a heavy one. Do not practice less than 30 feet from objects. A hand strap must be worn all time when practicing, to prevent mistakenly release a device from hands. Always check a device integrity before practice to prevent injury.