Soft Wood Plyo Box w/WeightShift Technology – Gronk Fitness Products $325.00 Make sure this fits by entering your model number. Get the MOST STABLE 20″, 24″ and 30″ tall plyobox, all in one – Unit Weights 75lbs Durable Wood Interior Core w/ Multi-Layered Foam – Double Stitched Vinyl Upholstery