Replacement Crucial roller brush for Dyson DC25 Animal perfect fit. The roller brush change took less than 5 minutes (closer to 2 minutes). It took longer to find a coin to drive the screw than it did to install. We also use Crucial replacement filters. They are durable and fit perfectly. We bought 2 sets: 1 set is in use and the second is on standby. REQUIRED: Check out the detailed instructions on YouTube posted by Crucial. End caps: included but I don't know why. They left it in their pocket for another day.