What size silk cord or thread is needed to make tassels?
You can make tassels out of any size thread or cord. The traditional tassels you might find on a piece of furniture or pillow use thick silk or polyester cord. The thicker the cord, the faster the tassel-making goes, so a cord like Gudebrod size FFF would be a good choice for a tassel that can be made quickly.
If you're making a more delicate tassel, choose a finer silk thread. If you're incorporating or embellishing a tassel with beads, choose a silk thread that coordinates with the size hole in the beads of your design.