You will need a power cord, some candelabra bulbs(I used color-changing LED bulbs), and a candelabra socket to use this. To make a string of them, you'll need extra lamp cable and of course more sockets. The cords and sockets will be available at most hardware stores. I got my bulbs at 1000bulbs.com under the christmas section. To attach the ball, you'll need to turn it backwards. A ball template is included for easy customization.