Gold Tip XT Hunter 400 Carbon Arrow Shafts (Pack of 12) 1 dozen Mathews Lost carbon arrow shafts 9.0 grains per inch with a +/- 2 grain weight tolerance .246" GT-Series nocks and .246" Accu-Lite inserts included Shafts are 32" long, have a straightness tolerance of +/- .003", have a .400" spine, have an outside diameter of .300" and inside diameter of .246" Nock colors vary