Altra Forward Mass System Micro Insert Weights Weight:10gr Fitted with a 61-grain aluminum

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

Multipurpose – Camouflage crossbows and other tools used in the field

cubed body means ultimate portability - go off road

Multiple Heat zones (Thighs

Altra Forward Mass System Micro Insert Weights Weight:10gr Fitted with a 61-grain aluminumThe 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