Aurifil Thread, 100% cotton thread, perfect for all your patchwork and quilting project.
50wt is a finer thread than 40wt. Both can be use for machine piecing to create nice flat seams.
50wt Aurifil Thread is particularly good in needle turn applique while 40wt Thread is perfect for machine embroidery and cross stitches.
Both 40wt and 50wt thread a particularly good for machine applique, piecing and quilting.