This model is a single coil wowned from awg14 magnet wire on a piece of 1/2" lite pvc pipe. The coil is in legnth 100ft and is as long when wownd as the projectile 2". Used a 1kv 800amp Stud diode in paralell with this coil, and a 100ft awg20 dissapation coil for easy switching. This model is mainly for testing different devices and cap's for future models kind of my R&D model.