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