Carbon Express Maxima RED 5mm Arrows 350 Spine 6 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 Arrows: Manufacturer: Carbon Express Color: Black Fabric/Material: Carbon Quantity: 6 Diameter: 5 mm Spine: 350 Features of Carbon Express Maxima Red 5mm Arrows: 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: Bohning Alpha VanesBulldog Nock Collars5mm Aluminum Sleeved 2-Piece 40 Gr Inserts Package Contents: Carbon Express Maxima RED 5mm Arrows Carbon Express CX05854: Maxima RED 5mm Arrows 350 Spine 6 Pieces Black