SuperBOBs #622 Gray L-style bobbins. 12 bobbins x 118 yds. each. SuperBOBs prewound bobbins are wound with a 60 wt. 2-ply polyester thread (our Bottom Line thread) and are fantastic for quilting, sewing, and embroidery. Lint free and lightweight, you'll love the convenience and quality of SuperBOBs prewound bobbins.