The Tandem Sport volleyball Spike Challenger is 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 stability and 2 wheels for easy portability. Adjustable pole height accommodates hitters of all sizes and skill levels. Ideal for ball contact, arm swing, footwork training techniques, repetitive hitting drills and conditioning exercises.