All choke coils in this series are the same size as the unit illustrated. Leads are of No. 20 tinned wire. Values from 1 uH to 18 uH are wound on phonolic forms. Values from 22 uH to 100 uh are wound on iron core forms. Tolerances are +/- 20% for W10G through W22G: +/- 10% from W27G through W101. All units are impregnated with thermosetting varnish and are EIA color coded.