Package of (4) Replacement Dyson DC17 Belt. You must select the belt width for your model above. There are two variations of the Dyson DC17 belt, the 8mm wide version and the 10mm wide version. Other than the widths the two belts are the same. The 8mm wide belt replaces Dyson part numbers 911710-01 and 11710-01-01, and the 10mm wide belt replaces Dyson part number 11710-01-02. The 8mm wide belt will fit any DC17 model, as it will fit roller brushes with the 8mm wide track and the 10mm wide track. The 10mm wide belt will only fit DC17 models that have a roller brush with the 10mm wide track and will not fit roller brushes with the 8mm wide track. All orders ship the same day if received by 3pm MST.