Your new STM Mini-Revolution Milling Machine comes with these blade discs included, but you can purchase additional discs so cleaning the machine and restarting your milling operation is much quicker. Either your fine or coarse food-grade steel blade disc will be used depending on the type of product you are using and type of pre-roll you are making. Luckily the great folks at STM Canna have provided significant support so you will learn all the tech needed, and when to use which blade and why. The versatility on these machines is incredible and you can dial in the finished milled product for just about any pre-roll style or size.