Carbon Express Maxima RED 5mm Arrow Shafts 350 Spine 12 Pieces Black. This quick stabilization helps keep broadheads tracking consistently and supports repeatable downrange accuracy across a wide range of setups. Its small-diameter profile helps resist wind drift while improving penetration and 360 degree spine consistency keeps performance uniform from arrow to arrow. Straightness is rated to +/- 0.002 inches max with a +/- 1.0 grains weight tolerance for dependable tuning and grouping. Specifications for Carbon Express Maxima RED 5mm Arrow Shafts: Manufacturer: Carbon Express Color: Black Fabric/Material: Carbon Quantity: 12 Shaft Length: 32.8 in Diameter: 5 mm Features of Carbon Express Maxima Red 5mm Shafts: 5mm Small-Diameter Hunting Arrow Shaft Red Zone With Tri-Spine Technology Fast Arrow Recovery Broadhead Stabilization Improved Penetration Resists Wind Drift 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 Collars5mm Aluminum Sleeved 2-Piece 40 Gr Inserts Package Contents: Carbon Express Maxima RED 5mm Arrow Shafts Carbon Express CX05851: Maxima RED 5mm Arrow Shafts 350 Spine 12 Pieces Black