Best Seller. Fitness classic! Plyometric boxes from Power Systems are designed to provide maximum stability and durability during your workout. Our plyo boxes are constructed of fully welded steel frames, and the tops are made from reinforced 3/4" plywood with a non-slip surface to maximize safety. Specific dimensions below. Complete set is available. Features: square tubular steel construction. Reinforced top with thick rubber mat for safety and stability 4 sizes, from 12" to 30". Square and stackable for easy storage. Sold individually or as a full set of 4 Rubber bottom to protect floors and prevent movement. Use indoor/outdoor. Black/black. 5-year limited warranty Dimensions: 12" Box: 22" x 22". 18" Box: 25" x 25". 24" Box: 28" x 28". 30" Box: 32" x 32".