Carbon Express Maxima XL 23 Arrow Shafts 400 Spine 12 Pieces Black. Its larger diameter supports line-cutting potential while Tri-Spine Technology stabilizes the arrow at launch for predictable tracking downrange. 360 degree spine consistency promotes uniform shaft behavior for reliable tuning and match-to-match accuracy. Straightness is rated to +/- 0.025 inches max with a +/- 1.0 grains weight tolerance and it includes 12 Bulldog nock collars. Specifications for Carbon Express Maxima XL 23 Arrow Shafts: Manufacturer: Carbon Express Color: Black Fabric/Material: Carbon Quantity: 12 Shaft Length: 32.5 in Features of Carbon Express Maxima XL 23 Arrow Shafts: 23-Class Diameter Arrow Shaft Built For Competitive 3D Shooting Line-Cutting Diameter Advantage Tri-Spine Technology Stabilizes The Arrow At Launch 360 Degree Spine Consistency For Uniform Shaft Behavior Straightness: +/- 0.025 Inches Max Average Straightness: +/- 0.001 Inches Weight Tolerance: +/- 1.0 Grains Includes 12 Bulldog Nock CollarsOther Components Sold Separately Package Contents: Carbon Express Maxima XL 23 Arrow Shafts Carbon Express CX05815: Maxima XL 23 Arrow Shafts 400 Spine 12 Pieces Black