I use Miyuki 330 dtex 100% nylon thread.
Here are a few great alternatives I also like:
KO (made by Miyuki) or One-G (by Toho)
Nymo
FireLine or DuraThread
Whatever you choose, make sure the thread is thin enough to pass through your beads several times and strong enough not to fray easily.
I order most of my thread at Perles & Co š·
