Preciosa : MC 23-210 Square FB 4 x 4mm - Jet (144pcs)
As with all of our beads this item is manufactured to be the highest quality and would be a great addition to your bead store. We sell this item to stores by the Pack/144pc, and it is 4mm by 4mm in size.
Please note that we now have many resources for bead stores such as information about industry standard units and the manufacturing process. There are also sections about glass cane and finishes/coatings used for beads.