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Absolute Mag™ Magnetic Polystyrene Particles, 67.4 μm (# WHM-S196) are paramagnetic particles prepared by in-situ coprecipitation of irons oxide particles in a polystyrene polymer grid, with high monodispersity (CV: 1.4%), high saturation magnetization, and high colloidal stability. The particle surface is rich in carboxyl groups, but these carboxyl groups cannot be used in subsequent reactions. https://www.cd-bioparticles.com/product/absolute-mag-magnetic-polystyrene-particles-67-4-m-item-whm-s196-12812.html