The Killer Instinct HYPR-V Nocks in white are engineered for peak performance with narrow axle-to-axle crossbows. Designed to improve nock-to-string contact and minimize serving wear, these precision nocks enhance accuracy and durability during repeated use. They are compatible with all Killer Instinct crossbow models except the 1120 Swat XP and Furious Pro 9.5. Whether you’re using current or older models, this 12-pack ensures reliable performance for your HYPR-V bolts.