Single coil; 55turns no. 26awg polyurethane wire; two wire leads 3 in. And 7 in. Min lg; bobbin core; pc bc mount; 0.562 in. Dia; 0.375 in. H; 3mh inductor for 0.5amp peak svc; 0.1amp rms svc; inductance 0.600mh min; 0.760mh max; resistance 0.30ohms max