Compability-Compatible with Dolphin Nautilus CC Plus, Nautilus CC Supreme, Premier, M400, M500, Supreme M4, Supreme M5, Triton Plus (old), Nautilus (old), Quest, Apollo, Apollo Plus, Edge, DX6, DLX5, Deluxe 4, Deluxe 5, 3001, 2x2, Wave 90, Prowler 830; Part#3884997-R6 Not Fit- not compatible with the Nautilus CC, Nautilus CC Pro Durable Guide Wheels and Pulley Gears-Wear-resistance, aging-resistance, and high-hardness, less prone to tearing during frequent and long term use High-Quality Part-High-quality materials, which are not easy to damage and have a long service life Package Included-4 Pack Guide Wheels with 2 Pully Gears Compability-Compatible with Dolphin Nautilus CC Plus, Nautilus CC Supreme, Premier, M400, M500, Supreme M4, Supreme M5, Triton Plus (old), Nautilus (old), Quest, Apollo, Apollo Plus, Edge, DX6, DLX5, Deluxe 4, Deluxe 5, 3001, 2x2, Wave 90, Prowler 830; Part#3884997-R6