D 4 x 1 mm
Material NdFeB Neodymium Shape Disc Size 4mm diameter x 1mm thickness   /- 0.1mm Grade N35 Operating Temperature ≤80℃ /176F Plating Triple plated (Nickel-Copper-Nickel) Magnetic Face Axially Magnetised Quantity  100-1000 Vertical Pull Force  0.13 kg against minimum 5mm steel plate