The replacement filter basket is compatible with the following for Dolphin Robotic Pool Cleaners: S50, S100, Active 10, Active 15, Echo, T15, T25, Proteus DX3, Saturn, Cayman, Escape, Prowler 910, Prowler 917, Warrior SL, Encore, E10, Explorer E20, Solo, Advantage, Nautilus CC, PLEASE NOTE - IT'S NOT COMPATIBLE WITH Nautilus CC Pro, Nautilus CC Supreme. IMPROVE YOUR ROBOTIC POOL CLEANER'S PERFORMANCE - Worn out tracks cause several performance setbacks for your automatic pool cleaner. It may begin with sluggish movement, lack of traction on the pool floor, and inability to climb walls. Don't wait until the cleaner begins to malfunction. Get ahead of your pool cleaner maintenance with a pair of brand new, high-performance timing tracks. COMPATIBLE WITH For NUMEROUS MAYTRONICS DOLPHIN ROBOTIC POOL CLEANER MODELS - Perfect for models that require 2 tracks (one on either side) including models: for Dolphin DX, for Dolphin Explorer, for Dolphin Apollo, for Dolphin Wave, for Dolphin Nautilus, for Dolphin Advantage, and more. REPLACE TIMING TRACKS IN PAIRS - It's tempting to just replace the one track that looks worse for wear. But the truth is, the other timing track will soon follow on the tracks of its pair. Deterioration isn't always obvious especially for timing tracks that had worn out in a steady and clean manner. But as a role of thumb, timing tracks that are over 2 years old should be accessed for wear and replaced as needed. Please rinse and clean every 4-6 weeks for the best performance. Colour:White & Gray Material:Plastic Package Contents: 1 * Pool Cleaner Filter 9991460-R1 2 * Pool Cleaner Timing Track 9985006-R2 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.