The Pinnacle of Precision & Performance Altra non-micro Forward Mass System (FMS) insert weight system offers fine adjustment of total arrow weight to increase F.O.C. and improve down range accuracy. The non-micro insert weights are designed for use with all Altra arrows larger than 166 and are stackable for infinite weight adjustment.

Features:Comes in 12 pk QTY;Available in 10, 20, & 50 Grains;Blue Loctite recommended for assembly