Our replacement XHT Predator lawnmower blades are made in USA using patented technology using heat treating process which results in XHT Predator blades to be harder than any lawnmower blades on the market even OEM blades. Because Sunbelt blades are made from high quality steel they stay sharper and last longer. These replacement blades are the most impact resistant and offer superior mulching capabilities. The unique air flow tooth design creates more airflow for efficient mulching.