Compatible with robots: Polaris 180, 280, 360, 380 , 480 Pro, 3900 Sport Size: outer diameter: 4.4 cm; inner diameter: 0.5 inch; length: 7cm Easy installation: simply remove the worn brush and replace a new hose tail cleaner The pool hose tail scrubber can replace worn out scrubbers dislodge pool cleaner for ensure that algae, dirt, and debris from floors, walls, and steps in the pool area Package includes: 10 x Foam Brush