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EFD30 Main Power Transformer Horizontal BobbinEFD30 flyback transformer bobbin. 7+7 pins horizontal EFD30 ferrite transformer bobbin, Parallel Distance=27.5mm. Pin distance=4.5mm. Bobbin size=31.0mmX31.0mmX18.0mm, for special size bobbin, we make new bobbin tooling to meet customer's design.