Gold Tip Nitro Crossbow Bolts have been designed to keep up with todays fastest and most powerful crossbows. The Nitro features the same versatility as the Laser II and Laser III, but in a heavier weight and stiffer spine to increase kinetic energy and withstand the speeds and kinetic distortion imparted by todays high-performance crossbows. Flat nock. 20 long. Per 6. Straightness tolerance: .005. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Carbon Bolts.