Supply ER49 transformer bobbin. 10+10 pins coil former. Horizontal ER49 two grooves bobbin. We only presented a standard ER49 transformer bobbin in our website. We manufacture final ER49 high power transformer, If you need support, please tell us the parameters you wanted, and we will advise suitable ones for you. If your size is special, we can also make new tooling. For final ER49 high frequency transformer, has low magnetism leakage and good operating performance, we can start from samples.