Predator Air 4mm arrows are built around a micro-diameter profile designed to reduce drag and support consistent long-range flight. Each shaft is produced with 360-degree spine consistency to promote uniform flex and repeatable launch behavior from arrow to arrow. Straightness is held to +/- 0.025 inch max with an average straightness of +/- 0.002 inch, and weight tolerance is +/- 2.0 grains. The arrows are finished with Q2i Fusion Shield-Cut vanes and include 4mm aluminum 50-grain outserts.