These beads are on 15 - 16 inch strands, temporarily strung, usually on monofilament (fishline).
The holes are relatively small, about 1mm. You won't be putting leather through them.
Donuts are passe. Once they were not.
Luckily I stocked up back then, a decade ago.

Click on an image or product name to see a larger picture and more info.

Combine ALL individual bead strands to get the pricebreaks.