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- 500, Bow Poundage - 30-50 pounds, Grain WT./Inch - 7.2, Inside Diameter - .245" Outside Diameter - .287" Straightness +/- 0.006, Comes in 6-Pack. Dead Ringer, deadly accurate products made by passionate and fanatical outdoors enthusiasts