Malossi carbon reed petals for improved responsiveness over steel variants. Should the petals break up, there is the added assurance that they will simply be chewed up by the engine and spat out the exhaust and not cause irreparable damage as with the steel versions. Carbon petals are a must in any engines. Engines respond differently to different reed thicknesses. The thicker the petals the higher the engine can rev. Delivery includes 4 reed petals.