This Tesla Coil secondary has 1000 turns of 26awg magnet wire. The secondary coil is 4.5" in diameter and 17" long, 16" of which has magnet wire wound onto it. The length of the wire is approximately 1170 feet long. The Tesla Coil comes with 2 end caps made out of MDF, they are a very tight fit. There is also a center hole for attaching a Tesla Coil top capacitor.