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EI28 Vertical 5+5 Pin Bobbin For Electronic TransformerEI28 coil former with 5+5 pin. Vertical EI28 winding bobbin. Bobbin Size=26.4mmX22.2mmX19.0mm. Pin pitch=5.0mm. Parallel Distance=17.5mm. Transformer phenolic bobbin. UL REC:94V-0. We can make new bobbin tooling to meet different requirements.