Refurbish fiber optic sights by replacing broken or damaged rods, or change your sight colors to enhance your sight picture with these super-bright replacement rods. Sold in 6" lengths; cut to fit your needs. Fiber optic filament sold in 6 or 12 inch lengths is the most economical way to buy, but you'll need to know how to install. We hold these truths to be self-evident, the light gathering properties of fiber optic are not created equal and you can only make the best fiber optic sights if you use the best fiber optic.