Dead Ringer Nutralyzer Arrows are 6.2mm High-Strength Bolts created to be compatible with all broadheads. Arrows are crafted with a high-strength pure carbon construction so they can withstand hard hits. Featuring a 0.006 straightness, these arrows can shoot swiftly and accurately. Arrow Specifications: Spine- 350, Bow Poundage - 60-75 pounds, Grain WT./Inch - 8.7, Inside Diameter - .245" Outside Diameter - .297" Straightness +/- 0.006, Comes in 6-Pack. Dead Ringer, deadly accurate products made by passionate and fanatical outdoors enthusiasts