Victory VForce TKO Sport 400 spine Carbon Arrows - 12 Pack - The VF TKO is the ultimate standard diameter hunting arrow. The 100% all carbon shaft incorporates MaxxKe Technology increasing kinetic energy during impact and allowing for faster arrow recovery in flight. These arrows are the fastest recovering, most accurate standard diameter arrow offered in the industry. 100 percent all carbon shaft incorporates MaxxKe Technology increasing kinetic energy during impact and allowing for faster arrow recovery in flight Accurate, extremely durable, and have the most consistent spine uniformity of any Victory arrow Straightness tolerance: +-.006in