E.T. Glow Fibers...These are ultra fine fibers. I have Pink, Bright Yellow, White, Lime Chartreuse, Orange, Sky Blue this time. And boy does this stuff GLOW!!!! I don't mean a little bit but I need sunglasses to look at it. I put a hank under the light for 3 seconds and shut the lights out and WOW!!! A nice big hank of E.T. Glow Fibers.