Golf Bullet designed to develop, improve and maintain golf athletic skills and technique. Use a device only on a grass surface to prevent injury from an impact with a hard surface. There are five length of Golf Bullet – short, medium, medium-long, long and extra long. Go to Sizes Chart to see all devices length. A short length of a device designed for kids practice. Do not practice 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.