Perfectly Fit: Our climbing ring replacement kit is designed for Dolphin Robotic Pool Cleaners like M200, M400, M500, Nautilus, Nautilus CC Plus, DX3, DX4, DX6, Aquarius XL, Premier, Oasis Z5i. Great Value: 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 Premium Quality: Our replacements are made from heavy duty rubber; ensure to last longer. They are perfect for maintaining your pool safe and functioning properly. Manufacturer Warranty: All parts come with 60-day hassle free return policy, so if you have any issue using the product, simply reaching out to us and we will issue the 100% refund.