Wide Application: Excellent for plyometric and speed drills, improve shoulders, arms, chest, glutes, and legs while strengthening and improving overall core stability. They can be also used as an ordinary stool when not training. Easy to Assemble: Our fitness step trainers are divided into several parts, which are very easy to assemble. Just tighten it with our accessories for training. The feet with pads can not only prevent slip, but also keep the floor from being scratched. Trapezoidal Structure:Our box platform is a trapezoidal structure, a set of three packages, which are 12, 16 and 18 inches high. The design of upper and lower sections ensures a stable structure and does not occupy space for storage. Rubber Grip Platform: The platform of this plyometric jump boxes are covered by ribbed rubber; they are anti-skid to keep your posture safe and help maintain a grip on the box landings and prevent injury. Durable Plyo Box: Made of heavy steel with powder coating on the surface, our 3 plyo boxes are durable and rust-proof. The welded part of the frame is firm, durable, and stable under high-intensity training. Recommended Weight Limit: 350 lbs.