This is a 20mm diameter rare earth circular magnet, n42 grade, made of neodymium material, which is a strong permanent magnet with a thickness of 4mm. The surface is plated with nickel copper and nickel, with axial magnetization. The product has a unit weight of about 9.5g, a tensile strength of about 4.5kg, and a surface magnetic field strength greater than 2500 Gauss. The price depends on the quantity you purchase, as well as the requirements for tolerance, magnetic grade, and temperature resistance.
Kind reminder: Neodymium iron boron strong magnets are made of rare earth sintered materials and are fragile, afraid of collision. Therefore, when separating and using them, it is important to pay attention. When attracting, do not allow the magnet to directly adsorb at a certain distance (it should be slowly moved and sucked up). After separating the magnet, it may not be able to directly attract at a certain distance, which may cause fragmentation and corner falling. When separating, it is difficult to pull it vertically and it needs to be moved left and right, rubbed open, and slid open. Please do not collide directly to avoid injury from debris.