All choke coils in this series are the same size as the unit illustrated. Leads are of No. 21 tinned wire. Values from 1 uH to 3.9 uH are wound on phonolic forms. Values from 4.7 uH to 18 uh are wound on iron core forms. Tolerances are +/- 10%. All units are impregnated with thermosetting varnish and are EIA color coded.