Want to increase horsepower without spending a lot of money? Then try Boyesen Power Reeds. Boyesen Power Reeds have an advanced dual stage design . The specially shaped top reed is lightweight and resilient for excellent throttle response at low RPM. While the stiffer bottom reed is ported for maximum flow and horsepower at high RPMs. The Boyesen Pro Series Reeds are designed with the latest carbon fiber technology and still feature the dual stage design. Pro Series Reeds offer maximum acceleration, horsepower, and torque. Last longer than other carbon fiber based reeds.