Respond quickly and accurately to piston speed changes for smooth, dependable throttle response High-tech carbon fiber with all the advantages of Boyesen's exclusive dual-stage reed design Offers the quickest acceleration any reed can offer; maximizes horsepower and torque Replacement reeds are packaged as cylinder sets - One set is required per cylinder No sacrifice in reed life like traditional carbon fiber reeds. PRO SERS REED KX125 04-05