320 yards per spool. Nylon. Colorfast. Sunfast. Doesn't stretch. It is .12mm wide and fits through a Size 10 needle. Perfect for braiding with size 11s and size 14s.
For those of you who like to crochet, this is a great string for that. Is does not have any stiffening to it so it shapes beautifully. Some have used it in a sewing machine. I don't know what size needle.