The GRS1012 kit comes with two 1.5V clear micro bulbs and two plated headlamp housings for use as headlights in N thru O scale vehicles. It also contains two 1.5V red micro bulbs for use as taillights. Simply drill into front and rear lenses from inside and glue bulbs into place. A terminal strip and 24" of wire are provided for hookup to a 1.5 volt power supply. Complete installation instructions provided.