The fluorescent tubing is the brightest tubing for hook dressing and an excellent fish attractor. The vinyl and plastic tubings are a little stiffer than the latex. Use on salmon lures to keep the hook straight in line behind the spinner on steelhead and trout for more attraction. Colors codes starting with V for vinyl, P plastic, a L latex. the letter at the end is F-Flourscent, O-Opaque, T-Transparant. Sold by the foot.