Detailed info for each thread weight is available on the
Aurifil site.
Please follow the below links to learn more.
12wt Cotton:
Embellishment and Sashiko
28wt Cotton:
Hand Quilting & Blanket Stitch
40wt Cotton:
Machine Quilting and Embroidery
50wt Cotton:
Piecing and Applique
80wt Cotton:
Piecing and Applique