✔ HIGHLIGHT YOUR CLOTH - It definitely Glows in the Dark!!! 30 weight Glow in the Dark Embroidery Thread, it is thicker than standard 40 weight Embroidery Thread. ★★IMPORTANT★★ Please use Topstitch Needle with larger eye to work with, such as SCHMETZ Topstitch 80/12 or 90/14 size. Will prevent the tangled/break issues. | ✔ FIVE ESSENTIAL COLORS - Amazing 5 Essential Colors of Glow in the Dark Thread, 550 Yards length each spool perfectly decorate your T-shirts in Party, Halloween, Christmas Season, even the Sky and Stars projects! | ✔ ECO-FRIENDLY MATERIAL - Simthread Glow in the Dark Thread is using enviromental material. It will not harm your skins. Resistance color fading is also outstanding, thread holds up colors in daily use no matter laundering, bleaching, rubbing, washing, perspiration, etc. | ✔ CAUTION - Glow in Dark Thread DO GLOW in the dark evening, WILL NOT GLOW in the daytime. Few customers reported the thread not glow at all, because they put in the day light to check. It should be ckecked in the total dark evening. | ✔ AMAZON #1 THREAD BRAND - SIMTHREAD. Over 20 years manufacture experience, giving you the best Polyester Embroidery Machine Thread. Happy sewing and Embroidery your own colorful life! 【MAKE SURE BUYING THROUGH "Simthread" (Sold by) for original WARRANTY!!!】