Flat milling blades can mill foods more finely, it’s easier to mill coffee beans, beans, sugar, almonds, sesame, walnuts, and other nuts than cross blades. The Blade is made of food-grade stainless steel and the shell is made of food-grade PP material (Polypropylene). It’s safe and healthy, sharp and durable. High Quality Replacement Parts. Dishwasher safe, non-toxic and never needs sharpening. This blade is made of stainless steel and the base is made of food grade plastic. Ideal replacement parts of NutriBullet 900W and 600W, please do not try for other blenders. Please note this is not the original NutriBullet milling blade. This is a high-quality aftermarket replacement milling blade for NutriBullet and similar brand blender. It is made from durable stainless steel and is very sharp. Please be careful when using it for the first time. Please clean the blender cup and milling blade after each use. If you find that the blade is difficult to install, please try to rotate the blade before installation. If the blade still does not fit, please contact us in time, we will solve the problem for you as soon as possible.