These are a Must for awsome handling (Slot Car Turning)& top speed (Real World fastest on planet). Made of strong lightweight G-fiber materials (not plastic). They are lighter then other Jet Ski sponsons and streamline in design for the ultimate in handling and top speed (like riding on rails). Aggresser Sponsons are thinner (1/4 inch thick) and have less drag then all other sponsons. These Jet Ski sponsons do not create aggravating boat lift, and help in reducing porpoising (keeps pump in the water for better hook up and acceleration). Kawasaki Jet Ski STX 160 STX 160
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