The Briggs & Stratton 491588S Air Filter is a genuine part Made in the U.S.A. This blue plastic filter is lightweight at 2.2 ounces and comes individually in the pack. Specifically designed as a replacement for model 491588S, this air filter is essential for maintaining the performance and longevity of your lawn mower. With the trusted brand of Briggs & Stratton, you can be assured of quality. Free shipping to the lower 48.