Friedrich C-90 series electronic air cleaner cell ionizing wire. The wire length measures 14-3/8" center to center of eyelet hole. Used in cells measuring 16 x 12½ x 4½".
Eyelet hole is 1/8" dia. Wire diameter measures 0.010". Ionizing wires are made of tungsten wire with stainless steel eyelets. The wire and eyelets are non-magnetic. The Friedrich 616-556-00 is the same as the Honeywell 136434BA.