Independent laboratory sound studies show that the Silent Knight vanes make just half the sound of other competitor vanes. This includes those popular and over-hyped, two-inch, high-profile vanes. See the comparison below, which shows an asonishing improvement that will dramatically reduce misses and high-hits due to deer ducking the arrow. Our team at Flex-Fletch is proud of our high-quality products. If you are not satisfied, contact us and we'll make it right.