The Chuuparts 5105512S 5601252 3Pcs Blade Set is the perfect addition to your Ferris mower maintenance routine. This set, compatible with the 400S model, ensures smooth and efficient cutting. The upgraded blades provide superior performance, extending the life of your mower and reducing noise during operation. With a blade set that ensures precise cuts, you can enjoy hassle-free lawn care without the hassle. Designed for durability and efficiency, this product is a must-have for any homeowner or landscaper.