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EI28 Vertical Single Slot Transformer Bobbin With 5+5 PinsEI28 vertical transformer bobbin. 5+5 pins EI28 bobbin. Bobbin Size=26mmX21.5mmX18.85mm. Parallel Distance=17.5mm. Pin Pitch=5.0mm. DIP transformer bobbin. We can make new bobbin tooling to meet different requirements. UL REC:94V-0.