Made by fixing several permanent magnetic bars in a framework to attract passing iron elements on the bar surface so as to guarantee equipments in a good state and products keep safe. We could build all kinds of magnetic filter frameworks with the highest surface flux of 11000 Gauss. Specifications 1) Outside material: stainless steel pipe 2) Inside material: NdFeB magnets (or ferrites) and iron spacers 3) Diameter: 20mm to 50mm, normal: 25mm 4) Price unit: per set or per meter 5) Inspection procedure: appearance, linearity, surface gauss for magnetic bars