440 yds. of very fine, flexible clear polyester monofilament which is on an easy to use snap spool that will deliver the thread easily off both horizontal or vertical spool pins without the thread spilling off. No rough edges on the spool to tangle, snarl or break the thread. Does not melt with normal ironing through cotton setting. Soft, strong and smooth for all your invisible sewing needs. Works well in the bobbin too. I use this thread when stitching down machine applique or bias applique so my thread blends in.
When you are using this fine thread it is important to use the proper size needle, I use Schmetz Universal 60/8 Needles.