Build your own plyo stack! 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. The 18-inch size is great for advanced-level exercises and plyometric routines.