Rotary Evolution replacement blades are made of black etched carbon steel. The set contains 12 blades and the screws that go with them, so a blade change is done in one go without hunting for fasteners.
The set replaces Worx WA0190, Kress KA0001, KA0002, KA0011, Mowox ARM 3 BLA and Einhell 3414020 and fits Worx Landroid S250-L2000 and WR141E-WR216E.1, Kress KR 101E-237E RTKn, Bosch VisiMow 18-V100 and 18V-200, Mowox RM 30-RM 1200 and Einhell Freelexo.
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.