The Killer Instinct Speed Ring Crossbow Scope is an elite, high-performance crossbow scope. Easy to use Speed Ring adjustment allows the scope to be instantly matched to any bow shooting speeds between 270 to 450 feet per second. The Speed Ring features the expertly designed Killer Instinct KillZone XB100 reticle, optimized for both fast and short distance target acquisition and precision long range accuracy out to 100 yards. FeaturesElite, high performance crossbow scopeEasy to use speed ring adjustmentInstantly match crossbows with speeds from 270-450 feet pet secondOptimized for both fast short range target acquisition and precision long range accuracyLumix optic clarity Micro adjust red/blue illumination