Easton ProComp Target 880 spine Carbon Arrows - 12 Pack - Easton's new A/C ProComp arrow is now available for compound target and field competition. ProComp is designed for top archers looking for the ultimate parallel shaft to boost scores at competitive and club-level compound events. The NEW ProComp was proven at high level tournament circuits this past summer by World Champions, Steve Anderson and Braden Gellenthien, taking five World Archery podiums. The 4MM ProComp is an easy-to-tune shaft using accurate aluminum-carbon construction with reduced wind-drifting and offered at an attractive price. ultra-lightweight 7075 aluminum core high-strength, high-modulus carbon jacket .0015in straightness tolerance +/- 0.5-grain weight variance