Barnett Crossbows Hyperflite Lumenok Lighted Nocks. These lighted nocks use an ultra-bright LED to enhance visibility in low-light conditions and simplify arrow recovery. Weighing just 23.8 grains they help maintain precision and consistency shot after shot. They are intended only for a specific Hyperflite vane configuration and are not compatible with alternate Hyperflite vane options. Specifications for Barnett Crossbows Hyperflite Lumenok Lighted Nocks: Manufacturer: Barnett Crossbows Color: Red Features of Barnett Crossbows Hyperflite Lumenok Lighted Nocks: Ultra Bright High Visibility Red LED Easy To Replace Battery LED Illuminates Instantly As Arrow Is Shot Compatible With Small Diameter .204" Hyperflite Arrows Only Compatible only with White And Red Vanes Hyperflite not compatible with White and Orange Vane Hyperflite arrows Package Contents: Barnett Crossbows Hyperflite Lumenok Lighted Nocks