Spalding NBA Portable Basketball System Portable basketball system with 54-inch acrylic backboard Heavy-duty steel frame; Arena Slam breakaway rim Screw Jack lift system adjusts from 7.5 to 10 feet in infinite increments 3-piece, 3.5-inch round steel pole; front cover acts as rebounder 40-gallon base fills with sand or water for stability NOTE: Refer the User Guide before use.