Features 1.Compatibility: The arrows lighted nocks is suitable for the shaft with an inner diameter of 6.2mm, which can meet the needs of people 2.Plastic Material: The shell is made of hard plastic material, strong and durable, hard texture, not easy to damage, long service life 3.Simple Operation: The arrows lighted nocks are simple, easy to understand, without the aid of tools, clamping shaft can be used 4.Automatic Lighting: The tail of the luminous arrow can be automatically lit and manually closed. The light is stable and the LED lamp has a long service life 5.Excellent Accessory: The arrows lighted nocks can help us see the path of the arrow clearly at night, so that we can quickly locate, is a practical accessory Specification Item Type: Lighted Nocks for Arrows Product Material: PE Weight: Approx. 19g / 0.7oz Length: 4.5cm / 1.8in Battery: Built In Button Battery Model Number: SR416SW Capacity: 8mah Package List 3 x Lighted Nocks for Arrows