Ensure optimal performance of your lawn mower with our high-quality air filter and pre-filter kit. Designed for compatibility with Briggs & Stratton models 491588 399959 491588S this kit offers a perfect fit and easy installation. Enhances engine efficiency by filtering out dust and debris. Extends the life of your lawn mower by preventing premature engine wear. Easy to install, ensuring minimal downtime for maintenance. Durable materials for long-lasting use and reliability. Upgrade your lawn mower's functionality with our dependable air filter and pre-filter kit, and enjoy a smoothly running machine that stands the test of time. Colour:As Shown Material:sponge Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 10 set * Lawn Mower Air Filter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.