Ravin .001 R500 Series Arrows have been designed specifically to match the high speed and high performance of Ravin R500 Series Crossbows - featuring an incredible straightness tolerance of .001 (inclusive of 100-grain field tip or broadhead) for the uncompromising Apex Hunter. These durable arrows withstand the enormous kinetic energy of R500 bows while providing a smooth in-flight path that's true to the target. Use In Ravin R500 Series Crossbows Only 6-pack 400 Grain (With 100 Grain Field Tip- Not Included) 100% Pure Carbon Construction Straightness Tolerance: .001" High-impact Brass Threaded Inserts 2" High-profile Offset Vanes High-impact Aluminum Nock Bushings Ravin-engineered Polymer Nocks * Use Only Ravin-branded Arrows With Ravin Clip-on Nocks