For cnc router, tools can be called the consumable products. First, everyday working will consume the blade–that is natual thing; second, when a starter work with the CNC router for working, it is easy to break the tools when practice.
We provide different tools with different function: some is professional for cutting, like 3D tools here photo: 
Some other tools are good for engraving on wood surface; some are good for smaller file; so what kind of tools you need depends on what kind of job you want to do.
Mini router blade is smaller that with higher resolution; but bigger blade is faster.
If you have more question about cnc router, please contact Redail.