Small Cylindrical Industrial Ndfeb Magnets
https://www.mlmagnet.com/product/ndfeb-cylindrical-shape-magnets/small-cylindrical-industrial-ndfeb-magnets.html
The Small Cylindrical NdFeB Magnets are one of more popular types of permanent magnets. They consist of a ferrite core with a NdFeB magnet coating and are ideal for instrumentation, switchboards and motor starters, sensors, and magnetic fasteners. These cylindrical NdFeB magnets are ideal for clamping, attachment, and position-sensing applications. They feature high coercivity and strong nickel-based plating, which reduces corrosion.