LodeStars 2.7 µm magnetic beads are precisely engineered superparamagnetic particles. LodeStars particles are an ideal foundation for building high sensitivity, highly reproducible immunodiagnostic assays. Precisely engineered, highly uniform particles deliver excellent assay precision and reproducibility. Assay specificity is achieved due to low, nonspecific binding. High binding efficiency ensures increased assay sensitivity. The physical and chemical properties of the particles make them versatile in both manual and automated instrument-based assay and separation systems.