The Rubex 3 propeller is constructed with an exclusive squeeze cast aluminum process that ensures durability. Designed with stronger blades for better performance, the Rubex prop provides outstanding acceleration and top speed for boaters. Wide blade design is ideal for 4-stroke motors. Prop Series EVendor Part Number: 9511-143-21Propeller and Hub Kit sold separately. This Rubex Propeller is the prop housing and blades only. Outstanding acceleration Hub kit required | Rubex 3 3-Blade Prop, Exchangeable Hub / Aluminum, 14.3 dia x 21, RH