PPS-6K, Polystyrene Particle Size Standard Kit, Flow Cytometry Grade, 2.5E6/mL, 6x5mL, 2.0-2.4um, 3.0-3.4um, 5.0-5.9um, 7.0-7.9um, 8.0-12.9um, & 13.0-17.9um