http://www.cd-bioparticles.com/p/Silanol-Magnetic-Particles_20_193_221_493.htmlAbsolute Mag™ Silanol Magnetic Particles, 4.0-5.0 μm (# WHM-Q084) are core-shell polystyrene microspheres, prepared by coating a thin layer of iron oxide shell onto polystyrene core particles. They are particularly useful in cell separation, protein purification, and immunoassays.DNA/RNA Purification, Cell Isolation, Immunoassay, Clinical Diagnosis