Superior Threads NiteLite Glow 40 wt. Glow-in-the-Dark Thread 80 yds Spool; Set of 6 colors 111-01-SET Price is for 1 Set of 6 Spools each with 80 yards of Superior Threads NiteLite Glow 40 wt. Thread; includes all colors in this thrad brand NiteLite Glow is made from Glow-in-the-Dark Polyester; charges in natural or artificial light in 30-60 seconds and glows for up to six hours, night after night and a dense stitch is needed for NiteLite to sufficiently glow Ideal for decorative applique, embroidery, quilting, children's clothing, pajamas and pillow cases; washer and dryer safe (do not bleach) Home Machines: Topstitch #90/14; set top tension to 3.0 Longarm Machines: #18 (MR 4.0); reduce tension as needed