WonderFil pre-winds 80 wt DecoBob™ thread on a reusable plastic bobbin; no glue or wax holds it together which makes for happy machines! DecoBob is an ideal bobbin thread, since using a finer weight thread minimizes the bulk in your fiber project, yet DecoBob also has the strength, versatility, and reliability you can count on. Because DecoBob is a cottonized polyester thread, its matte finish will also help it blend into your fabric so that the bobbin thread shows less. These bobbins are wound uniformly, meaning you will get more consistency in all your stitches which is especially noticeable when doing embroidery. They also come wound with a higher density of thread than when you wind your own bobbins on your home sewing machine. This master set includes one 110-yard bobbin each of 36 colors plus 2 extra bobbins each of white and black. To learn more about bobbin sizes, download the WonderFil Bobbin Guide »