The premium mulching blade is a fantastic blade for weekly mowing and gives you the runtime and cut quality you expect from a high-end lawn mower. This all steel blade is specifically designed for the all EGO Power+ Select Cut 21 in. lawn mowers. The Edge upper blade is the 2nd blade of the multi-blade system and is included with this kit. This blade slices the grass the lower blade sucks up to enhance the cutting performance. The EGO Select Cut Multi-Blade System is EGO’s solution to replacing premium gas lawn mowers for good. EGO parts and accessories are designed specifically for your EGO Power+ lawn mower and offer the highest quality and performance.