Killer Instinct s premium Hypr Crossbow Bolt now features the new V-Track nock designed for ultimate accuracy on our narrow axle to axle crossbows. The new V-Track improves nock to string contact, reduces center serving wear and works out of all Killer Instinct Crossbow Models. The Hypr-V crossbow bolts are available in 6pks or 3pk lighted and will come standard with all 2025 crossbow models. The V-Track nock will also be available separately. Product Features LENGTH ?20" STRAIGHTNESS TOLERANCE - .003" Total Grain Weight: 390 grains with 100gr Point INNER DIAMETER - .300"