There is no problem with magnetization. Demagnetization does not go well unless it is done many times, there are cases where the method is magnetized contrary to Mazui. I am saved if the price is a bit cheaper.
Because it was cheap, I bought it with a light feeling that "even give us goods even give up", I'm sorry I am losing. It is one magnetization just by making one round trip to the base of the driver. And powerful! It is! I do not think that it is impossible for me to make it from the size that "it can be used with the driver attached" as in the item description. Well it's easy to magnetize, so there is no need to wear it.