Black Opaque - 13c
These are size 13 cut (charlotte) beads from the Czech Republic. They are sold by the hank.
Cut beads come on a hank that is 1/2 the size of a hank of regular seed beads. There are approximately 3,000 beads per hank.
Size 13 seed beads are smaller than size 11. Thread size O or OO is appropriate for these beads, with a needle size of 13 or smaller.