Although our blade is made of premium grade Japanese steel with protective coating, frequent or intensive use may cause the blade to wear over time. When you feel that you need a little more effort to cut and the cuts are no longer clean or accurate, it may be time to sharpen the blade. We recommend this as part of maintenance for your ClassicPro, EnduroPro, PrecisionPro, and PowerPro models. You may refer to your product user guide for steps on sharpening your pruning shears.