Spalding NBA Hybrid Portable Basketball System - 54" Acrylic Backboard 54" x 32" Acrylic (4.5mm) Backboard with 1" x 1" Steel Frame with Aluminum Trim Height Adjustment 7.5" to 10" Infinite Adjust. 40-gallon capacity base for water or sand Ultimate Hybrid Base 200 lbs of Sand or Gravel & 19 Gallons of Water with Removable Lid for Easy Storage Access Breakaway rim with Board Pad Front Cover for Rebounder During Play with 16" board Offset.Heavy duty solid steel arena-style breakaway rim