Boyesen PSR-121 Replacement Pro Series Reeds for Rad replacement valve

The latest carbon fiber technology with all the advantages of Boyesen's patented dual-stage reed design Utilizes a carbon fiber top reed and a durable fiberglass/epoxy bottom reed Offers the quickest acceleration any reed can offer; maximizes horsepower and torque Responds quickly and accurately to changes in piston speed for smooth, dependable throttle response No sacrifice in reed life like traditional carbon fiber reeds Designed for the newest 2-stroke technologies