Black Mountain Products Adjustable plyometrix box is made from reinforced steel, creating a robust training machine. Each Plyo Box is made with three adjustable heights for beginners to the elite fitness trainers. Heights can be adjusted to 12, 16, and 20 in height. The surface area measures a generous size of 15.5 x 25.5, for total control and stability for all jump exercises. Jump boxes are the perfect tool for any home gym training or heavy use at the gym. Plyo box training is the perfect tool to train for CrossFit, baseball, basketball, football and more.