This is an inexpensive bracelet.  It looks good on.  But I am not sure how long it will last.  I am not too worried about it for what I paid.  You can see the knot in the clear elastic cord used and there seemed to be some shredding of the cord.  But it has not been a problem so far.  I don't know if the magnetic effect is strong enough to have any affect, but it is just a bracelet.