The device roller magnetic is based on the use of neodymium magnets, which are embedded in a casing made of stainless steel mostly AISI304. As a result, it is possible to precisely remove ferromagnetic elements from the mixture. An important element of its operation is the repulsion of magnetic poles N and S, which enables magnetic substances to be attracted. The thickness of the magnet and its structure's pitch affect the power and range of the separator's operation.