Quikfletch W/Y/Y Twister Fletch for Crossbow (3-Pack), 3-Inch QuikFletch Twister features NAP's patented micro-grooved vanes for enhanced stiffness, spin and accuracy at an economical price The QuikFletch Twister shrinks to fit any size carbon or aluminum arrow shaft The microgrooves have been proven to spin the shaft twice as fast as with a standard vane Weight: 35 grains; Vane Height: 15/32" (0.47")