These soft plyometric boxes can be used individually or stacked for variable height options depending on ability and progress. The Patented velcro tabs hold them in place for safety and confidence when stacking, and theyre light weight, so theyre easy to move while in use or for storage. Features: Stack - Patented velcro tabs so you can safely stack the boxes Covering - Durable PVC covering Filling - Made in the UK from high-density foam filling Design - Classic design and usability allows users to get back to the fundamentals and concentrate on what matters - performance Sizes - 01: 300mm/12". 02: 450mm/18". 03: 600mm/24" Specifications: Colour: Black Guarantee:1 Year Model Number: BLPLYS1