Quote Originally Posted by dudley View Post
http://www.animatedknots.com/dropperloop/index.php
The beads will slide up and down. A knot like connecting tippet to a leader will stop it from sliding. Also a small split shot.
They are awesome. You can change out your main fly all day and just slide the bead up a little more to keep fishing.

Medium is around a 3X and smaller and the small around 5X and smaller.