CFF 3 - N - 1 Wood Puzzle Plyo Box - 20/24/30 inch and Double Under Speed Jump rope Great for Cross Training, MMA, or Plyometric Agility Training, These 3 side plyo boxes save you money and space by combining 3 of the most popular size plyo's into one Made of cabinet grade 3/4" plywood; Pocket screws and fasteners Wood Plyo boxes are available in 12", 18",20", 24", 30" and 36" heights All edges are rounded over for safety Ships flat to save on shipping Glue not included and we strongly recommend pre-drilling pilot holes; The main holes are pre-drilled