... , POT1811, POT2311, POT2318, POT3019 or POT3622 bobbins ER9.5, ER11 or ER14.5 SMD series bobbins EI22 to EI50 series bobbins Toroid cores ... base holder series bobbins ET series bobbins UU.8, UU0.5, UU15.7 series bobbins UT20, ET20, ET24, ET28 or ET35 ...