You are looking at a brand new Sebo 5143 filter for the X series vacuum cleaner. Final stage exhaust filter which cleans the air before it is emitted from the vacuum cleaner. Compatible with X1, X2, X3, X1.1, X4, X4 EXTRA, X4 PET, X4 EXCEL, X5 EXTRA, XP2, XP3, X1.1 ECO, X4 EXTRA ECO, X4 PET ECO, X5 EXTRA ECO.