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EF25 High Voltage Transformer Bobbin 5+5 PinsEF25 through hole bobbin. EF25 transformer 5+5 pins bobbin. Parallel Distance=20.50mm. Pin distance=5.0mm. Bobbin Size=27.0mmX25.2mmX21.7mm. We accept custom designed EF25 electronic transformer, samples can be sent for prototype testing.