Altra Forward Mass System Micro Insert Weights Weight:10gr Microadjustable rails let you make

Microadjustable rails let you make quick

Multiple Heat zones (Thighs

Fitted with a 61-grain aluminum insert and 3″ Q2i Fusion X-II Vanes

cubed body means ultimate portability - go off road

perfect for attaching to any Last Chance Archery bow press

Altra Forward Mass System Micro Insert Weights Weight:10gr Microadjustable rails let you makeThe Pinnacle of Precision & Performance Altra Forward Mass System (FMS) micro insert weight system offers fine adjustment of total arrow weight to increase F. O. C. and improve down range accuracy. The micro insert weights are designed for use with all Altra 166 arrows and are stackable for infinite weight adjustment. Fitment: Altra 166 shafts Weight: 10 gr or 20 gr Quantity: 12 pk Blue Loctite recommended for assembly