Stack and securely Velcro together to provide a landing surface high enough to train max vertical jumps with stackable plyo boxes. Thermally welded top facing anti-slip surface Reinforced vinyl for less wrinkles and higher durability Velcro and flaps securely lock stacked boxes together. New Column New Column Material Soft foam outer core, anti-slip vinyl cover Size (L x W x H) Level 1: 3 x 30 x 36" (7 x 76 x 92 cm)Level 2: 6 x 30 x 36" (15 x 76 x 92 cm)Level 3: 12 x 30 x 36" (30 x 76 x 92 cm)Level 4: 18 x 30 x 36" (45 x 76 x 92 cm)Level 5: 24 x 30 x 36" (60 x 76 x 92 cm) Interior Dense foam core Markings Large, visible heights displayed Corners Soft corners Warranty 1 Year