This mulch blade set is designed for Ferris 400S, IS500Z, and IS1500Z mowers with a 44" deck, providing two high-quality blades for efficient mulching. The blades help create finer clippings for quicker decomposition and a healthier lawn. As genuine Ferris parts, they ensure reliable performance and meet high standards for durability. The set includes blades only, making it an easy replacement to enhance your mower's cutting capabilities.