Each pack contains one 12″ piece of 0.040″ diameter Ultra Super Flex fiber in each of our five vivid colors (blue, green, yellow, red, and ruby red). USF fiber is our standard bright fiber, which is excellent for general use in a variety of aiming applications. USF flares easily with heat (if needed), allowing for installation in nearly all sights styles.
Please note: Blue fibers rely on UV light to produce maximum brightness. This can be achieved by using the fiber outdoors, even in overcast conditions. Additionally, a UV sight light may also be used. Blue fibers may appear dull indoors where UV light is minimal.
Visit our products page to view additional sizes and colors.