Engineered with Dual Spine Weight Forward technology to manage energy better and make arrows recover faster. BuffTuff construction provides durability and a quiet draw. A great option for female hunters looking for a higher grain weight arrow for maxium kinetic evergy. Straightness tolerance: +-.0035", Weight tolerance: 1 gr. Available in sizes 150 (.495" spine, 8.5 GPI) and 250 (.380" spine, 9.3 GPI). Includes nocks and inserts.