Light up your embroidery, quilting, or hand-sewn projects with Wonderfil's Ahrora Polyester Glow in the Dark Thread. This 40-weight thread offers endless creative possibilities! Costumes, Halloween decorations, and more are a suitable use for this thread. It shines brightly for hours, and to "re-charge" it, stick your design under a bright light or place in the sun for a few minutes. Each spool holds 200-yards. Please note that besides the orange and pink thread, the rest of the colors glow green in the dark.