Engineered with Dual Spine Weight Forward technology to manage energy better and make arrows recover faster. BuffTuff construction provides durability and a quiet draw. Straightness tolerance: +-.0035", Weight tolerance: 1 gr. Available in sizes 250 (.380" spine, 8.9 GPI) and 350 (.333" spine, 9.8 GPI). Fletched with 2" vanes. Includes nocks and inserts.