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These are Aurifil monofilament thread. AKA invisible thread.
I'm using this for the first time quilting a rainbow quilt. No breaks, snags, or weird birdsnesting! I loooove it. Can't wait to post a photo when it is all finished.
Pumpkin Patch Quilter: Monofilament Thread (A.K.A. Invisible Thread)=Good info on monofilament threads.
Love this motif. Threads of Faith, LLC: New Threads of Faith Blog
Clear as Day: What Is Monofilament Thread for Quilting?
Great tutorial on how to quilt with clear (monofilament) thread!
How do I stop monofilament thread from unspooling concontrollably?
Oh so lovely! Bold Beauty Kit from Pat Bravo & #Aurifil
From Nancy Zieman: When sewing on buttons with metal shanks, use a strand of monofilament thread along with the standard sewing thread for added strength in keeping buttons in place.
Taking the Terror Out of Invisible Nylon Monofilament Thread: Best Practices Borrowed from the Experts