WORLD’S BEST BELT: This belt acts like the OEM belt in terms of engagement and operating RPM’s. The toughest, best all-around belt proven repeatedly in the most extreme conditions! EVP World's Best (WB) Belts are for the rider/racer that is looking for a tried-and-true OEM-style belt that’s more durable with proven enhanced performance. Third-generation heavy duty, high-twisted aramid fiber cord is used for high-horsepower machines, making it the strongest belt on the market next to our XR Race Series belt and surpassing our Extreme Belt. The WB belt has a high shock load rating to withstand the power of up to 400hp machines.