Specification Brand : BGD BulletPoint1 : The package comes with 4 pieces climbing rings. Part number: 6101611-R4 BulletPoint2 : The size is about 3.62in x 1.02in, and the diameter of central hole is about 1.89in. Please note, the size of our climbing rings will be different after being soaked. BulletPoint3 : Our climbing ring replacement kit is compatible with Robotic Pool Cleaners like M200, M400, M500, Nautilus, Nautilus CC Plus, DX3, DX4, DX6, Aquarius XL, Premier, Oasis Z5i. BulletPoint4 : The package comes with all four climbing rings 6101611-R4, also fit Sigma, Triton (old), Deluxe 4/5, Apollo Plus, Wave 65, Endeavor, Edge, HD, Saturn (old), Atlantis, Apollo, 3001, 2X2, Wave 2X2, Prowler 820/83 BulletPoint5 : Our replacements are made from PVA; ensure to last longer. They are perfect for maintaining your pool safe and functioning properly. Color : 6101611-R4 ItemName : BGD 6101611-R4 (4pcs) Climbing Rings Fits Maytronics Dolphin Robotic Pool Cleaners M200,M400,M500, Nautilus/CC and More Models Ultimate Wall Adhesion Made from Quality Material ItemPackageDimensions_Height : 23.7 centimeters ItemPackageDimensions_Length : 4.8 centimeters ItemPackageDimensions_Width : 19.3 centimeters ItemShape : Square ItemTypeKeyword : swimming-pool-and-spa-replacement-parts ItemTypeName : Pool Cleaner Manufacturer : BGD part Material : Foam ModelName : Pool Cleaner Timing Track ModelNumber : 6101611-R4 PartNumber : 6101611-R4 PowerSourceType : ac ProductDescription : (1) Part number 6101611-R4 Package includes: 4pcs Rings for dolphin Robot Swimming Pool Cleaner . (2) Models of replaceable dolphin robot climbing ring:M200, M400, M500, DX3, DX4, DX6, Nautilus, Nautilus CC Plus, Oasis Z5i, Aquarius XL, Premier,Sigma, Triton (old), Deluxe 4/5, Saturn (old), Atlantis, Apollo, Apollo Plus, Wave 65, Endeavor, Edge, HD, 3001, 2X2, Wave 2X2, Prowler 820/83 . (3) Once you know the basics, it will become easier to disassemble, replace the worn-out parts of your Dolphin pool cleaner. But the exact process may vary from model to model, Open the sides of the pool cleaner, You will need a screwdriver to remove the 4 screws on the side panel, Remove the tracks on each side/end of the opened pool cleaner, Snap out the ends of the brush roller, Only when both ends are snapped out that you can lift the brush roller out of the pool cleaner's frame, Use a flathead screwdriver to pry the small cap off the end of the brush roller's center tube, Remove the roller's center tube and then remove the gear caps. . (4) CAUTION: Check the climbing rings' pliability. Whether you are replacing both or just the climbing rings, dried-out foam rollers are difficult to remove and may damage the brushes. Soak the brush roller in water until they become softer and more pliable, Slide the climbing rings off the brush rollers. . (5) Install the new climbing rings. When you receive the new rings, please soak it thoroughly in water in order to prepare the product for optimal usage. Be careful in installing the climbing rings. Slide them in slowly and ensure that they are sitting in their designated space, Reassemble the brush roller assemblies, replace them in their designated slots, return the tracks, and screw back the side panels.