[Compatibility] Keuaaao X lighted nocks fit arrows with .204 inch inside diameter, compatible with standard bushings for easy installation. [Brightness] These arrow nocks emit a vibrant and highly visible light, making it easier to track your arrows during low-light conditions, including darker evenings and winter months. Ideal for monitoring arrow trajectory, improving shot accuracy, and simplifying arrow retrieval. [Easy On/Off] The light activates automatically upon release when contacted by the bowstring, featuring a linear switch design for reliable performance. A slider switch allows for manual shut-off. [Battery Life] Long-lasting battery performance provides up to 48 hours of continuous illumination. The LED remains highly visible even in bright daylight conditions. [Practicality] These lighted nocks are ideal for archery hunting, target shooting, 3D tournaments, and practice in various lighting environments, including low light and full sun. They help track flight path and locate arrows quickly. A great choice for archers who want improved shot visibility. Color: Green Material: Plastic Package Contents: 12 x Lighted Arrow Nocks Note: Light reflection and display settings may cause slight variations between the color shown and the actual product. Measurement may vary by +/- 1-3 cm.