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ER28 High Frequency Coil Former 6+6 Pins6+6 pins ER28 bobbin. Horizontal ER28 coil bobbin. Bobbin Size=36.6mmX30.0mmX25.2mm. Pin Pitch=5.0mm. Parallel distance=30.0mm. Phenoic material coil former factory, we R&D bobbin tooling, welcome custom made toolings.