Renowned for its exceptional strength and versatility, FireLine® thermally fused thread for jewelry-making by Berkley® is the designer's choice for stringing and weaving projects. This popular jewelry-making thread resists abrasion, threads effortlessly and can be used for knotting or crimping. Great for use with small to medium gemstones and Swarovski beads. UV protection to withstand sunlight. Fits Wide-eye Needle and #12 English beading needles. Testing for colorfastness is recommended.