welcome to my store , Hope you have a pleasant shopping trip! Features: 1. Suitable for all arrows with inner diameter of 6.2mm carbon shaft2. High quality ABS material, sturdy and durable. The double-button throat design is stable and does not fall off when used at any angle.3. Easy to install After taking out the arrow, just push the activation switch at the end of the arrow back to the off position4. To light the nock, insert the needle into the nock so that the cathodes touch each other.When lighting is not required, simply transfer both ends.SpecificationsCategory: Glowing NockMaterial: ABSSpecifications: 6.2mmLuminous color: yellow, red, bluePackage List:10pcs X LED NockNotes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. High Quality ABS Material, Sturdy and Durable. The Double-button Throat Design Is Stable and Does Not Fall Off When Used At Any Angle. Suitable For All Arrows With Inner Diameter of 6.2mm Carbon Shaft Easy to Install After Taking Out the Arrow, just Push the Activation Switch At the End of the Arrow Back to the Off Position To Light the Nock, Insert the Needle Into the Nock so that the Cathodes Touch Each Other.When Lighting Is Not Required, Simply Transfer Both Ends. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. High Quality ABS Material, Sturdy and Durable. The Double-button Throat Design Is Stable and Does Not Fall Off When Used At Any Angle. Suitable For All Arrows With Inner Diameter of 6.2mm Carbon Shaft Easy to Install After Taking Out the Arrow, just Push the Activation Switch At the End of the Arrow Back to the Off Position To Light the Nock, Insert the Needle Into the Nock so that the Cathodes Touch Each Other.When Lighting Is Not Required, Simply Transfer Both Ends. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.