The most proven and reliable 100% carbon arrow in the Carbon Express® line! Buff Tuff® Plus carbon weave on the rear 1/3 of the shaft, with a Mossy Oak® Treestand® finish on the front 2/3. BullDog™ nock collar, and Dual Spine Weight Forward™. Straightness tolerance: ±.0025". Weight tolerance: ±1.0 grains. Fletching color may vary.BullDog™ Nock Collar A Carbon Express® exclusive. Aircraft-grade aluminum collar that fits over the outside of the back end of the shaft, forming a barrier that protects your nock and arrow if it’s struck by another arrow.