For use with Easton 4MM arrows shafts A/C/E (all spines use #1) ProComp (1150-1000 use #1 | 880-520 use #2 | 470-420 use #3 | 380-250 use #4) Avance (2000-1400 use #1 | 1150-730 use #2 |660-550 use #3 | 500-340 use #4) Compatible with all Pin Nocks Weight: 9 grains Constructed of 7075 aerospace alloy Previous Shafts: Carbon One (2000-1400 use #1 | 1150-730 use #2 | 660-500 use #3 | 450-410 use #4) Apollo (2000-1400 use #1 | 1200-840 use #2 | 740-670 use #3 | 610-560 use #4) A/C/G (1500-660 use #1 | 610-430 use #2)