DMC-Light Effects Floss.  Glow-In-The-Dark 

This dazzling versatile thread can be used for a variety of techniques, from cross-stitch to needlepoint to all types of embroidery and creative stitchery. Stitchers can work with one to six strands either alone or in combination with floss or other needlecraft threads. Threads are washable, dry cleanable and resistant to tarnish. 8.7yd (8m). Imported.