Premium Power Plyo Boxes have a stable square frame and a large landing area. This heavyweight plyometric box is a solid choice for plyometrics training. Platform is covered with an extra-thick mat and the perimeter is rounded for added safety during exercises. Square tubular steel construction. Tops are reinforced 3/4" plywood covered with 1/8" solid rubber mat. Stackable for convenient storage. Use indoors or outdoors. Black. With receipt of product, instructions are provided to view and download various helpful Plyo Box training videos. Available individually in 4 heights (12", 18", 24", or 30") or in a set of 4. The 24", 30", and the set are shipped freight.