3) size:according to your requiryments.
4) Coating:efective surface treatment such as nickel zinc silver and so on.
5) Package:vessel package,air/express package.
Key Benefits
The strongest magnets in the world. They can lift up to 1000 times their own weight.
Far better permanent magnetic performance compared with traditional magnets, but the price is relatively low. (by weight about 20times Ferrite magnet, by dollars per BHmax about 1.5 times Ferrite magnet)
Wide range of grades with new ones regularly being developed.
Available from very small sizes to large blocks.
Relatively easy to machine, compare to AlNiCo and Smco magnets
High resistance to demagnetization.