These are in the 6 - to 8mm range and mostly irregularly-shaped rice. Their selling point is their specially drilled larger holes, rare for pearls. We have these drilled specially for us in the Mysterious Orient. No more awkward jamming with an awl or unladylike cussiin'. 15 - 16 inch strands, temporarily strung. The holes will generally take a 20 gauge wire. The holes on these aren't as large as the ones we had prior to 2011.