The small tesla coil features a 2 3/8" diameter secondary with 1000 turns of 30 gauge magnet wire and a machined aluminum combination baby toroid/needle point top terminal. The primary is 11 turns of 1/4" copper tubing wound in a 45 degree cone. It has a capacitor bank of 16 Ceramite laser pulse caps (2 series X 8 parallel), and a double copper adjustable spark gap. The primary is mounted on the base of the secondary and slides to adjust the coupling. The unit stands 17 1/2" tall from base to the tip of the secondary terminal. It's all powered by a Actown 4KV, 30ma neon sign transf., 120V, 120VA input, with three prong cord and pull string on/off switch.