Material NdFeB Neodymium Shape Block Size 4mm x 3mm x 3mm /- 0.1mm Grade N35 Operating Temperature ≤80℃ /176F Plating Triple plated (Nickel-Copper-Nickel) Magnetic Face 4mm x 3mm Quantity 10 -1000 Vertical Pull Force 0.35 kg against minimum 5mm steel plate