Sparkle Rays is a neon ribbon that glows in the light rather than the dark.
There are small speckles of metallic along the length of the neon colored ribbon. 
It will unravel past the end of the needle so short tails are called for. 
Be careful to lay Sparkle Rays as it is a ribbon and any twisting will detract from it appearance. 
Needlepoint 13 &14 Count canvas, 
Long stitches on 13-18 Count, 
Cross Stitch 7 & 8 Count