Nockturnal Lighted Nocks 3pk Red. Featuring a bowstring-activated linear switch these nocks illuminate ultra-bright LEDs with a simple slide of the external on/off switch allowing for effortless operation. Constructed from super strong clear polycarbonate that's both impact-resistant and durable these nocks are built to withstand the rigors of use in any environment. Specifications for Nockturnal Lighted Nocks: Manufacturer: Nockturnal Quantity: 1 Features of Nockturnal Lighted Nocks Activation: Bowstring-activated linear switch Construction: Super strong clear polycarbonate On/Off: Streamlined tool-free switch High-visibility LED lights Easy external on/off operation Durable and impact-resistant design Provides precision fit on virtually any brand of crossbow bolts String activated linear switch Ultralight speed saving design Clear plastic for maximum light transmission Package Contents: Nockturnal Lighted Nocks Nockturnal NT-813: Lighted Nocks 3pk Red