Barnetts popular HeadHunter arrows just got an upgrade with innovative strobing lighted nocks. These half-moon nocks feature multicolored strobing lights, tested to outperform static lights when identifying shot location and retrieving arrows in lowlight conditions. The arrows use a pressure-sensitive design to begin strobing on impact. When not in use, easily disable the strobe lights with an on/off toggle switch at each arrows nock base. No assembly required " begin using the HeadHunter 20" Lighted Arrows straight out of the box. Includes 3 arrows per pack and field points. Warning: Due to the Extreme POWER of the Hyper Raptor Crossbow - DO NOT USE HEADHUNTER STROBE LIGHTED NOCKS, ONLY USE either the Hyperflight Arrow, the Standard Headhunter Arrow or the Hyperflight Lighted Nock. Do not use the HEADHUNTER Strobe nock as this will DAMAGE your crossbow Product Features 13.78 grains per inch Fully assembled with multicolor strobing lighted nocks Tested for durability Continues strobing for up to 3 days Easy on/off toggle switch in nock base 20-inch arrows (also available in 22-inch length) Three arrows per pack Product Specifications Arrow Length: 20" Arrow Weight: 300g Outer Diameter: 0.347" Inner Diameter: 0.300" Straightness: +/- 0.006 Field Tip Size: 11/32