The Gravity Fitness 3 in 1 Plyometric Box offers a stable and solid platform, allowing you to increase your speed and power for increased athletic performance. Offering incredible versatility, you can switch between 3 different heights with one box thanks to its clever design. The 3 heights are 20" (51cm), 24" (60cm) and 30" (75cm) Solid Ply Wood construction with a reinforcing centre-piece, these Plyo Boxes are built to last. Comes flat packed. Easy to assemble with all screws and an easy to follow instruction sheet.