Perform Better First Place Economy Foam Plyo Boxes have a 100% foam core, offering the ultimate combination of durability, stability and safety. Stack boxes together or use alone to achieve desired training height. Made with a 100% foam core that will not break down or soften over time. Each plyometric box has three 2″ strips of Velcro to enable stacking and to prevent boxes from slipping apart. Handles allow for easy repositioning. All First Place Economy Foam Plyo Boxes are 36″W x 30″D. with varying heights and colors available.