Sulky Premium Invisible thread is a very fine .004 monofilament. It is polyester - not nylon - and therefore, much more heat tolerant. It will not melt with normal ironing through the cotton setting. It does not fuzz, fray, or shrink. Use clear for lighter fabrics. A smaller needle such as a 10/70 is recommended. This product is wound on a snap spool. 440 yds (400M).
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