AA 12 aluminum crossbow bolts aren't a standard, widely recognized product, but 
aluminum bolts offer a good balance of cost and performance, providing precision and speed, often with a stiffer spine than carbon, good for general use and hunting, though powerful crossbows (400+ FPS) often need carbon for durability, while longer, heavier bolts (like 20") improve penetration for hunting. 
Key Considerations for Aluminum Bolts:
Precision & Price: Good quality for less cost than carbon.
Spine: Generally stiffer than carbon, adding stability.
Hunting: Heavier bolts offer better penetration.
Power: For very powerful crossbows (400+ FPS), carbon is usually recommended for durability.