Carbon Express Photon 6mm Arrow Shafts 400 Spine 12 Pieces Black. Its lightweight construction supports stable flight while Tri-Spine Technology helps manage flex and reduce variation at the shot for dependable broadhead tracking. Built to 360 degree spine consistency standards each shaft is designed to tune quickly and deliver uniform performance from arrow to arrow. Straightness is rated to +/- 0.002 inches max with a +/- 1.0 grains weight tolerance for repeatable precision. Specifications for Carbon Express Photon 6mm Arrow Shafts: Manufacturer: Carbon Express Color: Black Quantity: 12 Shaft Length: 32.8 in Diameter: 6 mm Features of Carbon Express Photon 6mm Shafts: 6mm Standard-Diameter Arrow Shaft Lightweight Design For High Arrow Speeds Flat Trajectory Performance Tri-Spine Technology 360 Degree Spine Consistency For Uniform Shaft Behavior Straightness: +/- 0.002 Inches Max Average Straightness: +/- 0.001 Inches Weight Tolerance: +/- 1.0 Grains Components: Bulldog Nock Collars6mm Stainless Steel 40 Gr Inserts Package Contents: Carbon Express Photon 6mm Arrow Shafts Carbon Express CX05735: Photon 6mm Arrow Shafts 400 Spine 12 Pieces Black