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ER28 Transformer Bobbin Horizontal Double Slots Bobbin 6+6 PinER28 horizontal bobbin two slots. 6+6 pins ER28 transformer bobbin. Bobbin Size=29mmX28.2mmX24.3mm. Pin Pitch=5mm. Parallel distance=25mm. Phenolic material bobbin. We can make bobbin tooling. DIP bobbin. UL REC:94V-0