Built with high strength 100 percent pure premium carbon construction. High-impact Ravin Premium Lighted Crossbow Arrows have a straightness tolerance: .001. The vanes have a 2 inch high-profile offset. Also, includes brass threaded inserts and aluminum nock bushings. Use only Ravin branded arrows with Ravin clip-on nocks. Use in Ravin crossbows only Straightness tolerance: .001" High-impact brass threaded inserts 2" high-profile offset vanes High-impact aluminum nock bushings Ravin-engineered lighted nocks 100 percent pure carbon construction