These Masterpart replacement vacuum belts are designed to be compatible with Shark Navigator upright vacuum cleaners, including models NV350, NV351, NV352, NV353, NV355, NV356, NV357, NV360, NV22, NV42, NV44, NV46, UV400, UV410, UV420, UV440, ZU60, ZU561, and ZU562 Lift-Away series. Vacuum belts are essential components that transfer power from the motor to the brush roll, enabling effective cleaning performance. Over time, belts can stretch, wear out, or break, reducing your vacuum's suction and cleaning ability. This convenient 2-pack ensures you have a spare belt on hand when replacement is needed. Regular belt replacement helps maintain optimal vacuum performance and extends the life of your cleaning equipment. These generic belts offer a cost-effective alternative to original manufacturer parts while maintaining compatibility with your Shark vacuum cleaner.