Deluxe Indoor Aluminum Tennis System is a smaller version of the Gared volleyball system and is ideal for multi sport facilities. 4' O.D. uprights are constructed of a strong, yet lightweight anodized extruded aluminum for superior support and long life. Easy to operate ratchet winch sets net tension. Exclusive wedge lock holds sliding rail system securely. Use 3.5mm Polyethylene Tennis Net , sold separately. System Includes 1 4' O.D. Tennis Upright 1 4' O.D. Tennis Upright with Winch 2 4' O.D. Floor Sleeves 2 Hinged Brass Cover Plates 1 Year Warranty Net Sold Separately