Realistic Ball Movement-- Improve your hitting technique without ever chasing a ball with this volleyball training aid. Work on arm swing, ball contact and footwork without the need of another person. Benefits-- A great trainer to improve your wicked-fast arm speed and spiking power. Perfect for hitting, conditioning, and agility drills. Ease to Use-- It comes with a large hook to easily connect it to basketball rings, poles, broom handles, backyard playsets, garage ceilings, and many more. Kindly Note-- The height can be adjusted a little bit with the buckle on nylon strap. The Max length of the nylon strap is 90cm,the mini length of the nylon strap is 77cm. A Must Have for Spiking Techniques-- Lightweight, and durable, the Spike Trainer holds the ball securely in place while the attacker develops form and hitting techniques, ideal for use at camps, clinics and practices at all levels.