Our YYBL rare earth magnet are made of high quality neodymium magnetic material which make them up to 1-2 time tronger than ceramic magnet of the ame size.This et contain 40 Pc bar hape magnet which are well coated they are Ni+Cu+Ni triple layer coated for good rut reitance.It look hining on urface and could lat long. These are permanent magnet and won't loe their magnetim even when cloe to other magnet or drop down.