Where to find 120 Grit Glass Bead Media?

There is a guy on Ebay that sells both glass bead and glass abrasive (bead being round and abrasive being non-uniform shaped). His isn't sold by sand grit size - it is sold by a number system. #13 being smallest and #3 being largest if I recall. I'm guessing there is some kind of conversion chart.
 
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