Pietro M-Modal Probrewing Replacement BurrsThe Pietro grinders from Fiorenzato come preinstalled with the B Modal burr sets, these burrs are designed to be used for grinding both espresso and filter brewing methods. The M Modal Probrewing Burrs are designed specifically for filter coffee, promising a cleaner and clearer tasting cup of coffee. The Pietro grinders are the only hand grinders with vertically mounted 58mm flat burrs, these burrs are made from M340 Bohler steel with Fiorenzato's