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ER28 High Frequency Power Transformer BobbinEC28/28 though hole bobbin, 5+5 pins ER28 vertical transformer frame, phenolic material ER28 coil former. parallel distance=17.5mm. Bobbin size=25.0mmX23.2mmX27.0mm, pin distance=5.0mm. We are China bobbin factory and custom different injection toolings to meet customer's requirement.