Pronounced boo-Clay, this uniquely knotted thread is made with a 2 ply base with two other plies looping in and out making it a 4 ply thread. It comes 10.5 yards (10 meters) per skein. This highly textured thread is ideal for making stitches with dimensional effects. Although it may appear to be a difficult and unruly thread to work with, it is actually quite tame and easy to use. Rayon is the key to its ease of use and satin finish.