Viper 4 pin dovetail archery sight. Fiber Optic size is .010. 2nd axis adjustments, and built in MATTHEWS DAMPENER all CNC Machined from 6061 aluminum and MADE IN THE USA! REALTREE Camo pattern. Viper makes the best MADE IN THE USA sights on the market. Built to last a lifetime with stainless steel screws and machined steel sight pins. Backed by their Lifetime warrantee.