Innovative Built-in Weight Forward Technology, Patented BuffTuff Plus K-360° Woven Construction - Excellent strength and spine consistency for complete performance, BuffTuff - World"s toughest carbon arrow finish, Bulldog Nock Collar - unrelenting strength and durability for nock end impacts, Straightness: ±, 0035"" max, Spine Selection Tolerance: ±, 0025"", Size: 250, 0, SKU: FBCET1242