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EFD40 High Frequency Transformer Double Section BobbinHorizontal EFD40 double slots bobbin, 8+8 pins EFD40 transformer bobbin. Multi section EFD40 coil former. Bobbin size=42.9mmX41.1mmX17.5mm. Parallel Distance=35.1mm. Pin pitch=5.0mm. Phenolic material EFD40 bobbin.