This kit is for a custom set-up. It consists of cross span wires, cross span support wires, insulators and 5 catenary wire hangers. 2 tower masts (74142) are required at a distance of up to 500 mm / 19-11/16". The cross span wires are made of steel; the cross span support wires can be realistically tensioned. The catenary wire hangers are electrically insulated. This kit comes with set-up instructions.