Stacker, Fore-N-One ball pyramid. This pyramid is plastic and fill all four sizes of Stacker Ball Trays. Unlike the pyrmaids designed for a specific size, this pyrmaid is set on top of the stray and the balls are poured into it while the tray is in position on the ground. We recommend this pyramid for anyone using 140 or 240 ball trays even if they only use one size becuase it is easier to fill.