The CX Hot Pursuit is Carbon Express' newest innovation for the female hunter who wants to shoot better and make a difference. Shorter-draw shooters will love the ultra-light design of this arrow that delivers greater speed and a flatter trajectory with lighter bows for tighter pin gaps. Like all Carbon Express arrows, the CX Hot Pursuit comes with premium components including the exclusive LaunchPad precision nock and NRG-2 performance vanes. All Predator series sets are sorted and matched by weight for best-in-class consistency. Weight sorting tolerance is +/- 3.0 grains. Every Hot Pursuit series shaft is laser checked for straightness to a remarkable 1/10,000 of an inch. Hot Pursuit shafts are checked to a straightness of +/-0.006" as a maximum measurement, not an average. The "90" and "150" refer to the spine (or stiffness) of the arrow shaft. The lower the number the less stiff they are. Package of 6.