No need to wind bobbins anymore! Super Bobs come with 25 bobbins, each pre-wound with Egyptian-grown extra-long staple cotton thread. Due to the precision winding, each holds 30-60% more than a self-wound bobbin. The 50 wt, 2-ply thread creates neat, accurate stitches and sheds very little lint. 70 yards per L-Style bobbin.