These 6.5mm 3D carbon arrows combine speed performance, with unmatched precision and durability. Includes 6.5mm Microlite Super nocks and CB RPS inserts. Straightness: .003â€. Available in spines: 300 (8.8 gpi.), 340 (8.1 gpi.), 400 (7.4 gpi.) and 500 (6.9 gpi.).