While laser focussed on the hunt, every hunter seeks consistency. Not only do they boast an incredible straightness tolerance of just .001, but Ravin .001 Premium Match-Grade Lighted Arrows also compensate for the added weight of lighted nocks to weigh the same as Ravin non-lighted arrows for identical flight accuracy. The ultra-bright nock assists hunters and shooters in locating arrows quickly, effortlessly and consistently. For use in all Ravin models EXCEPT R500, R470, and R18 Series Crossbows.