The PSE EXT arrow may be the best target arrows ever made. featuring a small diameter and extra thick, wall high modular carbon shaft for exceptional strength and exceptional penetration. Every PSE EXT arrow is guaranteed to +-.001straightness and a 1/2 grain variance per dozen shafts. In addition, every PSE EXT arrow is spine matched. That means that if you purchase a dozen today and another a year from now, the same spine of the arrow will be the same and the weight of the arrow will be within +-3 grains. PSE EXT arrows are also fully Coated with PSE’s whisper coating to glide quietly over the arrow rest and easier removal from targets. PSE also uses an exclusive Fast Recovery System (FRS) technology in building each arrow. All shafts also feature a spine alignment mark for easy and accurate fletching.