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 Segway HA002E and fits Segway Navimow i105E and i108E, X330, X350 and X390, H500-VF, H800-VF and H3000-VF.
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.