They are all set before leaving the factory, so you can use them directly. The one on the machine is 30 degrees, and the two in the accessory bag are 40 degrees.
This doesn't require changing the wheels, it's covered with adhesive sandpaper. Sandpaper can be purchased on Amazon.
The service life is measured based on the quantity of products polished by customers, and sandpaper itself is also a consumable.
