12 wt 100% Egyptian cotton, double gassed and mercerized. Spagetti is great for quilting, longarming, topstitching, decorative stitching, and sashiko. Available in 41 solid colors. And colorfast when washed in detergent at 60 deg C and even withstands mild color bleach washing. Nonetheless, it is always advisable to test the colorfastness when working with white fabrics.