Carbon Express' premium Launchpad Arrow Nocks will fit an arrow to the bowstring tightly, yet allows enough space 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. The Launchpad 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. Delivers precision engineering and perfect balance that ensures superior accuracy for truest flights. Strength and Durability A- All Carbon Express? nocks are made of polycarbonate for strength and durability. Now offered in FOUR sizes: Launchpad .166 Launchpad .203 Launchpad .234 Launchpad .244