Bug Shop UV Glo Bug Bling Fly Tying Yarn - Looking for something new to add to your arsenal? Here it is! UV Glo Bug Bling! This yarn is made with an explosion of flash. Use it for Glo Bugs, add it to your favorite fly, conceal your hook, and use it for dubbing! It holds scent great! Your imagination is the limit! There is 5 feet per bag and the diameter of the yarn is approximately 5/16in.