The Champion Sports Foam Plyo Boxes are a must-have training tool for explosive jump and speed training, and a variety of plyometric drills! Stack plyo boxes together or use alone to achieve desired height when training. These boxes are made with a 100% foam core that will not break down or soften over time. Featuring Velcro® flaps to keep boxes in place as well as handles for easy re-positioning, these plyo boxes are available in 5 sizes (3", 6", 12", 18" & 24").