New Archery Products 2in Twister Arrow Fletching Vanes -The patented Micro Grooves on one side of each Twister Vane channel air over the vane for a flatter trajectory, while rotating the vane twice as fast as a conventional vane. Twice the spin equals twice the performance. The Super Tough material is the strongest vane material on the market. Available in white, green, and yellow. Enhance stiffness and spin for better accuracy. Weight: 7 grains per vane Height 17/32" (0.53") Available in white, green, and yellow