The magnets exist in two versions per size – the A version has a North Pole face visible; the B version has a South Pole face visible (so the A and B versions will stick to each other visible face to visible face or adhesive backed face to adhesive backed face). Either version will attract to a ferromagnetic (e.g. mild steel) material.
Magnetization Direction:the permanent Neodymium (Disc) Magnet which are with Strong 3M Self-Adhesive are usually magnetized through thickness (axial magnetized). 
.Coatings: Ni, Ni-Cu-Ni, Zn, white-blue Zn, Expoy, Gold,passivated, phosphated.
| SurfaceCoating | Coating Method | Coatingthickness(m) | Coating Color | Coatingfeatures |
| Nickel | plating | ≥5 | Yellow | Corrosionresistance strong,with outstanding resistance to high temperature andhumidity capabilities |
| zinc | plating | ≥5 | Silverywhite | Hasstrong corrosion resistance,anti-salt spray test ability . |
| gold | plating | ≥5 | gold | Hasoutstanding resistance to high temperature capability,corrosionresistance,good resistance to color change ablity |
| Ni-Cu-Ni | plating | 15-30 | sliver | strongcorrosion resistance |
| Epoxy | Electrophoresis | 15-20 | Black/grey | strongcorrosion resistance,outstanding resistance to salt spray,strong resistanceto high temperature, high humidity capacity |
The pictures 
Size : D20mm X 2mm
Quick Introduction on How to Send an Inquiry:
(1) Grade
(2) Size
(3) Magnetization Direction
(4) Surface Coating
(5) Quantity
