See It Easton Axis Arrows 5mm Pro Specs and Features Spine: 260 to 700 Grains per inch: 9.5 (340 spine) Outside diameter: .267 inches Inside diameter: .204 inches Straightness: .001 inches Nock size: ...

Available in spine sizes of 250, 300, 340, and 380, Easton's 4mm X10 Parallel Pro is a hunting-specific arrow built on the concepts of Easton's X10 arrows, which have been the standard for Olympic ...