A Precision Nock will fit arrow to bowstring tightly, yet with enough space to allow for a natural draw and release. An overly tight or loose fitting nock can negatively impact arrow flight and accuracy. Top shooters know that nocks are an important component of consistent, accurate arrow flight. This insight led Carbon Express engineers to develop the patent-pending Launchpad precision nock. Features: Precise contact points for controlled arrow release. Concentric design to center the nock in the arrow shaft for more consistent performance. Aligned nock barrel for true arrow flight. Precision engineering and perfect balance to ensure superior accuracy for truest flights. Made from polycarbonate for strength and durability. Size: .166. 12 per pack.