Dynabeads M-280 Streptavidin beads are 2.8-μm monosized, monodispersed, superparamagnetic, and hydrophobic beads covalently coupled to streptavidin. They are blocked with BSA and intended for use in the isolation and handling of biotinylated nucleic acids, antibodies, and other biotinylated ligands. The excellent dispersion abilities and the absence of magnetic remanence make the Dynabeads streptavidin products ideal for both manual and automated protocols, including microfluidic system protocols.