Description The CMI Archery 4.5MM Titanium Insert was purpose-built for archers that want a customizable setup. Constructed from high-strength titanium, these 50-grain inserts offer a lightweight yet rugged foundation that enhances arrow integrity and consistency shot after shot. Designed to accept 4MM screw-in back weights, they provide the flexibility to fine-tune arrow weight, balance, and front-of-center (FOC) for improved accuracy and performance.