The Easton Axis 5mm Match Grade Carbon Arrows with HIT Inserts and Collars - The hands-down proven small diameter all-carbon arrow. FeaturesHigh-strength carbon-composite fibers5mm small diameter uniform ACU-CARBONStraightness: .001" 5mm HIT 8-32 inserts included (16 grains)Pre-installed 5mm X Nocks (9 grains)NEW Match Grade HIT Collars included (13-21 grains)