3 in 1 Plyometric Box: 14″x16″x18″ Flatpack. New!! Get Your own Logo Custom Laser Engraved!! $99.95 Make sure this fits by entering your model number. Three sizes in one box! 14″, 16″, and 18″ Crossfit, MMA, Aerobic conditioning, plyometric exercise, athletic training, jump box, step box