High-strength USA made ACU-Carbon with uniform spine technology Pre-Installed Microlite nocks are lightweight and indexable Includes CB inserts (compatible with 6.5 Inserts sold separately) Straightness: +/- 0.006" Weight: 340 spine, 9.3 gpi | 400 spine, 8.4 gpi | 500 spine, 7.3 gpi