Textreme Power Thread Extreme 10 Denier is the thinnest tying thread ever developed, designed to push the limits of artificial fly tying. Made from a high-strength polymer up to ten times stronger than steel of the same diameter, it offers an unrivalled fineness/strength ratio. Ideal for tiny flies on #20 to #32 hooks, it creates smooth, uniform bodies and thoraxes with virtually invisible thread. Its thinness also makes it perfect for dubbing loops, where it remains unobtrusive and does not overload the rig, without having to split the thread as on a 25 Denier. Available in black (a solid color that won't fade) or natural white (easy to color with a marker), it's perfect for all situations where the thread needs to remain invisible. Packaged in 100-meter spools, with a strength of 0.44 kg, it requires the use of a ceramic-tipped spool-holder to preserve its integrity. A must-have for demanding fly-tyers working on the finest, most realistic flies.