Air Filter / Stihl 4180 120 1800Pack Size:1Stihl 4180 120 1800J. Thomas ST-401, Rotary 14085Stihl FC100, FC110, FC90, FC95, FR130, FS100, FS110, FS130, FS310, FS87, FS90, FT100, HL100, HL90, HL95, HT100, HT101, HT130, HT131, KM100, KM110, KM130, KM90 and SP90Width: 3 ", Length: 2 5/8 ", Height: 1/2 ", Woven fabric and foam