We offer duly insulated, long life induction coils, input 6-12 volts dc @ upto 5 amps, output spark length in air 5 mm to 200 mm or above, with adjustable handles, on off switch, indication light, on base upto 25 mm, and in covered wooden box with locks and key. Also available induction coils worked on 220 v ac mains, with built in transformer, and rectifier to provide proper voltage at proper amperes.