Volleyball Spike Trainer VST-500 Simple to Install - Designed to attach to the Ceiling Joists in your Garage or Basement, the Volleyball Spike Trainer (VST-500) is Simple to Install AND Requires Minimal Tools. Ease to Use - Adjust the VST-500 system to your preferred hitting height by sliding the bottom half of the Ceiling Mounts up or down, then start practicing your spike technique Durable, Quick Release Elastic Volleyball Assembly - Top-quality Volleyball with integrated elastic bands provides the perfect set every time for realistic hitting practice. The removable Volleyball Assembly allows for safe storage or simple replacement Adjustment Height - 11 Inches 30 Day Money Back Guarantee and Warranty - We are so confident you will love this product that we back it with a 30 day money back guarantee. We also include a 3 Year warranty on our Spike Trainers. (1 Year on Volleyball Assembly)