WONDERFIL SL METALLIC 40WT. THREADAdd a little glamour with this 40wt rayon core metallic thread! Soft, smooth running, and less prone to shedding and thread breakage, Spotlite is a brilliant and dynamic thread that is great for anything from machine embroidery to decorative stitches and even quilting. Unlike other metallic threads that are prone to breaking or shredding, Spotlite is quality built for a strong, even stitch and will even run up to 800 spm on domestic sewing machines