Magnetic Grate marketed by us is put into a 316 stainless steel tube, which is not visible.Each subsequent magnet is constructed in the opposite orientation, such that the magnetization direction alternates with each magnet. This grate is protected from contamination by the stainless steel, which is normally sealed tight with a weld.Magnetic Grate is comprised of non-magnetic stainless steel tubes with a magnet assembly within.Inside the tube, the magnet is normally organized in a row, with ring magnets on a shaft. It is very economical to use.