Trijicon is known for the high quality fiber optic materials used in their Fiber Sights. This sight is specifically engineered to produce the brightest point of light possible while also maintaining a refined sight picture. The Fiber Sights come straight from the factory with a .060-inch red fiber that is already installed on the front sight, as well as some red and greed replacement fibers in the package. Make sure to check the measurements before purchasing for your Sig Sauer model. If you are interested in this sight for a different weapon, it is made for some others as well.