Rotary Evolution replacement blades are made of black etched carbon steel. The set contains 9 blades and the screws that go with them, so a blade change is done in one go without hunting for fasteners.
The set replaces Husqvarna 5778646-03, 5776065-05, 5776066-04 (Automower Standard) and fits Gardena Smart Sileno Max 600-1500, Minimow 250, R40, R70, City 600 and Husqvarna Automower 105, 265 ACX, 305, 310, 315, 320, 330X, 405-450X and Aspire R4+.
Change all blades at the same time. A robotic mower runs with its blades balanced against each other, and a single new blade among worn ones makes the disc run unevenly.