ProMag® HP (High Performance) have been meticulously engineered for use in assay development. The highly optimized composition ensures lowest autosignal, particularly with respect to chemiluminescence and exposed iron. ProMag® COOH are supplied as ~2.5% solids (w/v) aqueous suspensions. ProMag® Streptavidin are supplied as ~1% solids (w/v) aqueous suspensions.: