PERFECT YOUR TECHNIQUE: The ultimate spike training device! Pre-positioned ball creates the perfect set every time so you can warm up your arm or perfect your spike SECURE DESIGN: This high quality volleyball spike trainer is constructed of metal & includes a ready-to-attach ball and cord system, 2 weights for stability and 2 wheels for easy portability MORE EFFICIENT SOLO PRACTICING: Ideal for ball contact, arm swing, and footwork training techniques, repetitive hitting drills, and conditioning exercises ADJUSTABLE HEIGHT: This volleyball training gear has an adjustable pole height to accommodate hitters of all skill levels QUALITY SPORTS GEAR SINCE 1989: Tandem Sport has been manufacturing and distributing quality volleyball, sports medicine, equipment and training devices to the sporting goods market since 1989