This highly portable system rolls easily on four large casters and locks in place with the flip of a brake. This unit is great for all ages and skill levels. It is designed for side court and multipurpose recreational areas. This unit is not recommended for main court use of dunking activities. BACKBOARD: 32� x 48" acrylic backboard (Model: GP48321SQ) � GOAL: Breakaway rim (Model: 724) � PADDING: Fully padded with high density polyurethane foam covered with non-tearing 14 oz black vinyl. Backboard padding is not included. � BALLAST: 250 lbs of ballast is required in the concealed space in the base of the unit. Ballast weight is not included. � HEIGHT ADJUSTABLE: Spring-assisted unit adjusts from 7' for juniors to 10' regulation height.