DMC Light Effects glow in the dark thread is an innovative new thread that lights up the night! After being exposed to light, this white thread delicately glows in the dark. It's a must for fun, bright projects, and kids will love it. Made from 100% polyester fibers, Light Effects floss is comprised of six size 25 easily separated strands. Light Effects uses a color numbering system that easily corresponds to the popular cotton DMC embroidery floss. You can add a subtle highlight to your stitching by combining one strand of cotton Floss with one strand of Light Effects. Or for a more vibrant look, you can substitute Light Effects for its matching shade in cotton floss. Details:Glow in the Dark (E940)8 m (8.7 yd.)100% polyesterComprised of 6 size 25 strands