Trophy Ridge React Pro Sight with React Technology and Tool-less Micro-Click Adjustments Mathematical precision of React Technology automatically adjusts all five pins to the optimal location Make easy corrections with advanced tool-less micro-click windage and elevation adjustments Strengthen accuracy at severe angles over longer distances with Third Axis Adjustment Durable stainless steel hardware and solid aluminum construction Ultra-bright .019 medium fiber optic yardage indicators to compensate for various environmental conditions