These six spools of 30 Wt. Cotton thread are perfect for your Christmas sewing projects. This traditional Christmas color palate will have you singing Christmas Carols before you know it! This pack contains 5 Solid Cotton Thread and 1 Blendables Cotton Thread. Sulky 30 Wt. Cotton Thread will help you make a more beautiful, bolder statement on your quilting, serging, embroidery and other decorative projects. Our 30 Wt. Cotton Thread is 1/3 thicker than 40 Wt. Cotton Thread. Loosen top tension slightly. Recommended Needle Size: 14/90 Quilting or Topstitch.