... Neodymium,Iron,Boron and some other transitive metallic elements to make it strong 1.General features Grades:N33,N35,N38,N40 ... , white-blue Zn, Expoy, Gold, and etc. Sizes: according to your requirments Shapes: disc,cylinder,sphere,block ,ring ,tile, arc, and ... : our brand is HRQ, if you need us to put your own logo on the product, it is ok. OEM: yes 4 ...