Have you ever hit your shins on a plyobox before? It hurts! With safety in mind Stroops has designed the Ergo Elite Plyobox. With curved edges, this plyobox helps eliminate the possibility of shredding up your shins during a powerful jump. Safety comes first, but saving space is a close second. These plyoboxes take up the same storage space, and you can easily slide them in and out without having to unstack the other boxes. These boxes are made of a fully welded, solid steel frame with a nonslip surface.