TP Rack's Pre configured Racking Systems come in two different options. The Starter Unit, to start off your row of racking or for a simple stand alone racking unit. The starter unit comes with 2 universal teardrop uprights, 4 universal teardrop beams & wire mesh decking. The Add On unit simply adds on to your starter rack unit to continue your row of rack. The add on unit consists of 1 universal teardrop upright, 4 universal teardrop beams & 4 wire mesh decks. If you have questions or need any help placing an order please feel free to call us toll free (877) 302-2337 or send us a chat online!