The new Maxma by Carbon Express with Dual Spine Weight Forward. Carbon Express challenges you to find a more accurate arrow than the new Maxima. With our patented Dual Spine Weight Forward technology, the new Maxima is a breaktrhough in arrow design and performance. We fuse two carbon spines into one: a stiffer back dramatically increases recovery out of the bow; a heavier front acts as “power steering” to guide the arrow precisely towards the target. Shoot Better. Carbon Express.