Fits the Dyson Animal Ball 2 I bought from Costco. I put 1 because the top of the package was open. Above all, it was dusty and heavy with smoke. Although I'm not allergic to dust, I couldn't breathe. I had an allergic reaction. I don't know how a package can be like this. I had to clean, air and disinfect everything in the house. After 2 days I felt better and was breathing normally.