Nexxus Infinity 400 Carbon Shafts - 12 Pack - Nexxus Infinity Arrow Shafts have the benefits of micro diameter arrows combined with extreme durability. These 4.2mm/.166 ID micro diameter shafts are paired with the Defender outsert system, providing increased penetration and durability for your arrow setup. This micro diameter shaft has less wind drift in flight, resulting in improved accuracy when compared to standard diameter shafts.