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 Series Crossbows.