I have a Dyson Animal Ball Vacuum DC 41 and the tips didn't fit. I removed the tips from both my old and new brush rollers and put the old tips on the new roller. The problem was that the plastic pieces that popped out to fit the vacuum's screws weren't long enough. Now it fits and works great and does its job much better. I would have given 5 stars if I didn't have to change the end caps.