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EF25 Switching Mode Power Transformer Vertical FrameMain power transformer bobbin, EF25 5+5 pin vertical bobbin. Bobbin Size=26.06mmX17.3mmX25.8mm. Pin pitch=5.0mm. Parallel Distance=12.6mm. EF25 phenolic material bobbin. We can make new tooling to meet special EF25 bobbin requirements.