One 14 inch strand of round mother of pearl/ shell beads, about 3mm in diameter. (The exact sizes of these particular beads will vary, which is why I have labeled them as Grade B.)
The holes are rather small, usually less than 1mm in diameter.
These appear to be hand-cut beads, so there may be variations in the exact size and shape of the beads. As with all natural beads, there will be variations from one bead to another, such as surface irregularities, difference in color and patterning, etc.