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Absolute Mag™ Magnetic Particles, Smooth Surface, 3.0-3.9 μm (# WHM-S041) consist of a thick layer of polymer coating on the surface to encapsulate the iron oxide coating, so there's no exposed iron oxide on the surface. They can be used for cell separation, affinity purification, DNA probe assays, magnetic particle EIA, etc, especially used in applications where exposed iron oxide causes undesirable interferences. https://www.cd-bioparticles.com/p/Magnetic-Particles_20_197_197_393.html