3-1 PLYO BOX 20",24",30"3 in 1 Soft Sided ANTI SLIP Ballast Plyometrics Box Get the Top Tier 20", 24" and 30" tall plyobox, with anti slip material. A Stable Plyo Box with a Shifting Low Centre of Gravity With the patent pending WeightShift Technology, when the plyo box is turned, the ballast 'flows' to fill the lowest internal face of the inner plywood box. Now, you have a plyobox with optimal balance and stability, no matter which side height you use. This virtually