These coils were used for measurements and development of JF coils.
 In perfect condition.
 
Dayton Audio 18 gauge iron core inductors are the most cost effective choice when large inductance values are needed for subwoofer crossovers. Features fully annealed refined copper wire with baked enamel insulation, wrapped around a laminated iron core.
Key Features
Laminated iron core construction
Highly refined copper wire
Baked enamel insulator
250 watts RMS power handling
±3% Tolerance