The TAC 15™ arrow is spined specifically for the dramatic force generated by the TAC 15™ crossbow. The TAC 15™ arrow comes in a 4 fletch configuration, .003 straightness, 26.25" long and weighs approximately 325 grains. The specially engineered nock is designed to work with the TAC 15™'s anti-dry fire device and is the only arrow approved for operation with the TAC 15™. Note: Only PSE TAC 15™ arrows can be used with the TAC 15™ crossbow. Use of any other arrows can cause serious injury and will void warranty of the PSE TAC 15™ crossbow.