Nockturnal S-Series Red Lighted Nock 3/pack. 244 inch. This Arrow Nocks and Inserts from Nockturnal installs quickly and easily straight out of the package. Nockturnal Lighted Red S-Series Nocks feature long-lasting super bright LED illumination that is visible even in daylight. Dependable Nockturnal Lighted S-Series Hi-Vis Red Nocks are waterproof and shock resistant - simply the best you can buy. Specifications for Nockturnal S-Series Red Lighted Nock: Manufacturer: Nockturnal Color: Red Fabric/Material: Plastic Diameter: 0.244 in Features of Nockturnal S-Series Red Lighted Nock: Bowstring activated linear switch Fool proof operation in any condition Long life lithium battery Super bright LEDs Water and weather proof Unsurpassed reliability Available in greenbluered and pink Fits standard carbon .244 ID shafts Package Contents: Nockturnal S-Series Red Lighted Nock Nockturnal NT-202: Lighted Nock S-series Red 3/pack