ball magnet: size:according to your design coating:zn,ni,epoxy,gold,ni-cu-ni grade:N35,N38 ball magnet :Shen Zhen AIM electronic CO.,LTD is a professional supplier of magnetic material. our products are exporting to many countries and are so welcomed. We have already passed ISO9001 certificate.ball magnet features:good embellishment propertyexcellent aid in meditationimprove memory ball magnet