Sebo 5110 X1, X1.1 X4 X5 clutch to roller belt (small) Sebo Main Dealer
Sebo drive belt from your Sebo Main Dealer Sebo shop 
Posted free of charge in UK mainland by Royal Mail tracked 48 
Genuine Sebo part from a Sebo Main Dealer and retail Sebo shop 
You can check the part because the original Belt will have the part number printed on the belt  5110