The coiled fiber optics on a Black Gold bow sight reside in the exclusive SkyCoil, a streamlined housing that is mounted on the very top of the sight where there is more available light. This system is more effective at gathering and transferring light than any other wrapped fiber bow sight.Black Gold's exclusive SkyCoil Technology gathers more light for brighter pins while patented PhotoChromatic Technology automatically manages pin brightness during the day. Independent tests show that the pins on a Black Gold bow sight are 20% brighter than the pins on the next brightest bow sight. This means you'll be able to see the pins on a Black Gold when the pins on other bow sights have faded away.If pins get too bright they can create star-bursts that make it difficult to see the vitals. Black Gold's revolutionary and patented PhotoChromatic shell, which covers the sight's fiber optic strands, turns purple when subjected to natural UV light. This automatically temp...