Extra strong, lightly waxed nylon thread. 70 denier 100 yard single reel is extra-fine for small flies, approximately 8/0.
Available in a wide range of colours: Black, Dark Brown, Fluorescent Chartreuse, Fluorescent Green, Fluorescent Fire Orange, Fluorescent Orange, Fluorescent Pink, Fluorescent Shell Pink, Fluorescent White, Olive, Red, White and Yellow.