Durable PVC Layer The Plyobox foam is wrapped in heavy duty PVC, to withstand extensive usage and ensure it lasts. The Safer Way Our Plyo Boxes are made out of High Density EVA foam that is soft enough to minimize the risk of tripping and falling, while providing enough density to make it feel like you're not jumping on a sponge. Modular Design Expand your height range and purchase bigger or smaller CORTEX Soft Stacking Plyo Boxes as you go! Available sizes are in 15cm, 30cm, 45cm and 60cm. You'll be able to have a huge range of heights up to 60" / 150cm with a combined set of 4. Boxes can be stacked on and connected securely with Velcro. Technical Specifications General Materials Heavy Duty PVC EPE Foam Set includes 30cm / 12" Soft Plyo Box Assembled Dimensions (Full Stack) 90cm x 75cm x 30cm (L x W x H) Gross Weight 6.5kg Warranty Information This product is covered by the following warranty/warranties: · 12 Months Parts replacement warranty *Please read our Warranty Terms & Conditions by clicking here