A micro diameter synthetic fiber with the ability to tie dry flies down to size 22. Blended colors to match the body and thorax color of the mayfly, with a touch of EPA(R) SPARKLE to give it that little extra translucency. I do not recommend using any type of wax when you apply this dub to the thread. Translucent Micro Diameter Fiber Extremely Durable Synthetic Material 0% Water Absorption Natural Floating Property - No Floatant Necessary Nothing Sticks - No Constant Cleaning of Fly