OnCourt OffCourt E-Z Airzone Tennis Target System - Hit Less Balls Into the Net / Adjustable Height NO HASSLE: The E-Z Airzone is a portable and lightweight air target system that sets up in minutes; no tools needed. ADJUSTABLE: Weather resistant aluminum telescopic poles allow for any adjustment in net height up to 7 feet. Raise net height with bungee. TEACHES ARC: The high-optic bungee guides players to drill either over or under the bright yellow line. REDUCE BALLS HIT INTO NET: Higher arc translates into 67% more depth on groundstrokes to drastically reduce the number of balls hit into the net. ONCOURT OFFCOURT: We are the leading creative resource for youth tennis, training aids, court equipment and ball machines. Over 10 million players have improved using our products in over 100 countries.