Not easy to work
After watching a Youtube video on tying Perdigones I decided to order these beads along with the Hanak 230 BL hooks in size 16. It is difficult to see the holes and once on the hook about a third of the beads were a struggle to move around the curve of the hook.
After a couple of tries of threading the bead on the hook I found it was easier to lay the bead on a flat white surface with the concave hole on the bottom. When looking st the bead it looks like a miniature igloo and when picking up the bead with pliers the small hole is in position to thread on the hook.
I consider the bead a novelty item and will move to a jig hook to keep a smaller inventory of fly tying items.