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EF20 High Frequency Transformer Horizontal BobbinEF20 power transformer bobbin, 4+4 pins horizontal EF20 transformer bobbin, phenolic material EF20 bobbin. Pin pitch=5.0mm, Bobbin Size=20.0mmX19.8mmX15.50mm. Parallel distance=15.0mm. We manufacture final transformers, custom design and OEM transformers also acceptable.