Ravin .001 Premium Match-Grade Lighted Arrows- The Premium Match-Grade Lighted Arrows have high-impact brass threaded inserts and aluminum nock bushings. Match-Grade arrows compensate for the added weight of lighted nocks and weigh the exact same as Ravin non-lighted arrows for the same flight accuracy. Have straightness tolerance of .001 inHigh-impact brass threaded inserts Aluminum nock bushings100 percent pure carbon construction3 Pack