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Compatible with Stihl FC55, FS38, FS45, FS46, FS55, HL45, HS45, KM55. The size of a single set is 5.8×6.2×1.1cm, ensuring a tight fit to avoid air leakage or unstable installation. Designed with double-sided felt material, it can effectively intercept dust, impurities and particles, improve air filtration efficiency, protect the engine and extend its service life. Equipped with a pre-filter structure, it can block large impurities before main filtration, reduce the burden on the main filter element, and improve the stability of the overall filtration system. Keep the air circulation smooth, help the engine maintain stable air intake, reduce fluctuations in fuel consumption, and make the lawn mower run smoother and have more stable power.