Dual Spine Weight Forward – rapid recovery and guidance control. Patented Diamond Weave – unparalleled spine consistency. Patented BuffTuff Plus carbon weave – excellent strength and durability. Tiger Blazer vanes/Tiger arrow wraps – added velocity and greater visibility after the shot. BullDog nock collar – unrelenting strength and durability for nock end impacts. Straightness: ± 0.001". Weight tolerance: ± 1.0 grains. Spine selection tolerance: ± 0.0025".