🌞Compatible Robots: Polaris 180, 280, 360, 380, 480 Pro, 3900 Sport, compatible with Polaris 91003105 / 9-100-3105 / PP-91003105. 🌞Size: Outer Diameter: 4.3 cm; Inner Diameter: 1.4 cm; Length: 7.3 cm 🌞Easy to Install: Simply replace the worn tail scrubber with a new tail brush. the hose tail. 🌞EFFECTIVE CLEANING: These filter absorbent sponges contain uniform parallel holes to effectively capture large debris, particles and eliminate pool cleaners, they also help to scrub the bottom and sides of the pool. 🌞Excellent value for money: 12 x foam brushes, no need to change every week.