The latest carbon fiber technology with all the advantages of Boyesen's dual-stage reed design Responds quickly and accurately to changes in piston speed for smooth, dependable throttle response Offers the quickest acceleration any reed can offer; maximize horsepower and torque Utilizes a carbon fiber top reed and a durable fiberglass/epoxy bottom reed No sacrifice in reed life like traditional carbon fiber reeds. PRO SERIES REED RAD-34E