Flow Check™ Ruby Red Fluorescent Microspheres are ~6µm narrow distribution polystyrene particles that can be used for flow cytometry applications where fluorescence emission in the range of 600nm to 710nm is needed. Suitable for 488nm and 663nm excitation, detection in PE-Cy5 or APC channels. Supplied as a 5ml suspension (~5 x 106 beads/ml) in convenient dropper bottle.