The new BLOCK IT™ WALL utilizes Velcro Net Antennas to attach to the net. Teach hitters to hit around blocks. Teach players to defend against a blocked spike and transition to offense. Use to learn correct position to back up the spiker. Improve defensive reactions. BLOCK IT™ WALL attaches over Velcro Net Antennas. Very portable. Will fit over most net antennas. Velcro Net Antennas sold separately.