Features 1、Automatic Lighting: Equipped with an automatic light up feature, these archery arrow nocks ensure clear visibility of the arrow in low light or dark environments, enhancing safety and accuracy during nighttime or dim light shooting. 2、Durable Plastic Material: Made of premium plastic material, these lighted arrow nocks are sturdy, wear proof, and impact resistant, guaranteeing long lasting and reliable performance for extended use. 3、Precise Shooting: The lighted arrow nocks make it easier to track the arrow during flight, increasing your shooting accuracy and improving overall shooting performance. 4、Easy Installation: Designed for compatibility with regular arrow shafts with a 4.2mm inner diameter, these lighted arrow nocks feature a convenient insert design, allowing for quick and easy installation and removal. 5、Versatile Applications: Suitable for outdoor archery activities such as hunting, target practice, and more, these lighted arrow nocks enhance the overall archery experience and performance. Item Type: Lighted Arrow Nocks Material: Plastic Weight: Approx. 10g/0.4oz Battery Type: Button battery SR416SW Single Battery Capacity: 8mAh (shipped with built in battery) Package List 3 x Lighted Arrow Nocks