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EF20 Flyback Transformer 5+5 Pin BobbinPCB mounting transformer bobbin. EF20 horizontal bobbin pin 5+5. Bobbin Size=19.9mmX19.9mmX17.3mm. Pin pitch=3.75mm, Parallel distance=15.0mm. Horizontal EF20 bobbin factory. We have bobbin tooling. We manufacture final transformer for customer.