A tube magnet is constructed of cylindrical permanent magnets contained within a stainless steel tube. The magnetic elements can be ferrite or ‘Rare Earth’. Rare Earth magnets develop very high magnetic field strengths and gradients enabling the extraction of the very smallest particle of iron or rust. Tube Magnets are very versatile and suitable for use with either dry or wet materials. A Tube Magnet can be used singly for quality control purposes or in multiples within a process, or built into magnetic traps for liquid lines or into grates for dry processes.