HIPA (Pack of 2) Pre Filter with Air Filter for STIHL FS85R BG75 FC75 FC85 HL75K Trimmer Length 2-3/8" x Width 2-3/8" x Thickness 1/4" Fitment models: STIHL FS85R BG75 FC75 FC85 HL75K trimmer Qty: 2pcs pre filter + 2pcs air filter