These strong, sturdy plyo boxes are used in gyms around the world for plyometric and explosive training. This brand new plyo fitness box is one of the simplest and most effective plyometric exercises that can be performed. Made with high-quality steel, powder coating, and metal top plate, these box jumps are durable and rust-proof. The 4 platforms separately measure 12", 18", 24" and 30" high, perfect for beginners and experienced athletes.