Premier Invisible .004 Polyester Monofilament
440 yds. or 2200 yds. of very fine, flexible
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. Also ideal on Sergers.