Combine a fast magnetic response time and high binding capacity with a large surface area, high sensitivity, stability, physical integrity, and fast reaction kinetics Typical applications include molecular biology, nucleic acid isolation, research, and clinical diagnostic immunoassays The core of the particle is made by a free radical emulsion polymerization of styrene and acid monomer Two layers of magnetite are coated onto this core, resulting in faster magnetic response times The surface is blocked with a non-surfactant, non-protein based method, to help prevent non-specific binding of proteins