Model air league hb58 basketball stand product overview the hb 58 is a professional size basketball stand from air league it has a virtually unbreakable acrylic backboard and is height adjustable from 7ft all the way up to the regulation 10ft for convenience a button on the back of the stand enables the user to adjust the height quickly and with very little effort the heavy duty polyurethane base can be filled with either 152kg of water or 160kgs of sand for serious play ideal for the pla