The ultimate spike training device! Pre-positioned ball creates the perfect “set” every time. Constructed of metal, the Spike Challenger includes a ‘ready to attach’ ball and cord system. Includes a weight for stability and 2 wheels for easy portability. Adjustable pole height accommodates hitters of all sizes and skill levels. Ideal for ball contact, arm swing, and footwork training techniques, repetitive hitting drills, and conditioning exercises.