The RBX Interchangeable Hub seats to the propeller hub cavity in order to eliminate hub chatter and vibration while preventing spinning within the propeller. It features a one-piece rubber construction with anodized aluminum splines - no plastics to deteriorate. Hubs offer 10° deflection to reduce banging when shifting gears or hitting a submerged object. All RBX hubs are reusable if the propeller is damaged. Designed for use with the following: Yamaha F75B and F90B and F100B/115 HP and 130 HP (1984 and Newer), F115 (4-Stroke) (2000 and Newer); 15 tooth spline 4-1/4" Gearcase, 150-225 HP (1984 and Newer), 15 tooth spline.