If you have a grat roller you need to replace with the gray version.

Only replaces DC15 using a black roller.

The Dyson DC15 Brush Roll Set with part number 10-3403-05 is designed for use with Electric Vac LLC brand vacuum cleaners. This set includes 1 brush roll, suitable for replacement or maintenance purposes. It is a compatible part specifically for the Dyson DC15 model, ensuring proper functionality and performance for your vacuum cleaner.