Customize the height of your plyo box with numerous combinations. Each thick foam platform is covered with durable, textured vinyl and can be stacked and secured with strong Velcro flaps on two sides. Heights are clearly marked on the sides. Handles with reinforced stitching to help in positioning the boxes, or moving them out of the way for storage. Sold separately or as a set. Save money by ordering them in this set of 4 (1 each of 6-inch, 12-inch, 18-inch, and 24-inch sizes.