I hand quilt with aurifil thread. Their quilting thread is a 40wt/2ply, other hand quilting threads, such as YLI is also 40wt but are a 3ply thread (one strand of thread more than the aurifil). I have had problems with the aurifil thread shredding but solved that problem by going to a larger quilting between ..... Jeana Kimball size 10, normally I use Roxanne size 11