The Plyometric Boxes offer the most stability & durability with 1 inch square tubular steel construction & fully welded frames. Athletes on any level can use these boxes for forward, lateral, & other plyometric jumping drills. Use taller boxes in combination with shorter boxes for a variety of drills such as, high jumps with step downs, & progressive height jumping Tops are reinforced 1/2" plywood with nonslip rubber surface. Stackable for easy storage. A great conditioning tool. Supplied with 12", 18" & 24" Plyometric Boxes.