Barnett Crossbows Headhunter Arrows. The HeadHunter Lighted Nocks pressure-sensitive design ensures they switch on automatically at the shot. They'll remain on for up to three days and can be turned off easily with an on/off toggle switch Specifications for Barnett Headhunter Arrows: Manufacturer: Barnett Quantity: 1 Length: 4 in Weight: 0.5 oz Height: 25.25 in Additional Features: No Width: 1.5 in Features of Barnett Headhunter Arrows For use with any crossbows compatible with standard-diameter crossbow arrows supporting half-moon nocks 13.78 grains per inch Fully assembled with multicolor strobing lighted nocks Tested for durability Easy on/off toggle switch at base of nock Package Contents: Barnett Headhunter Arrows Barnett Crossbows BAR20031: Headhunter Arrows