Material: Plastic and Stainless Steel. The Replacement Flat Milling Blades made exclusively compatible with NutriBullet 900W. Outer Diameter: 4.06Inch (103mm), Hight: 1.66Inch (42mm). PLEASE NOTE:This blade will NOT compatible with NutriBullet Lean (1200 watts) or NutriBullet RX (1700 watts) accessories 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. Direct replacement (Included the Seal Ring). Replacement Flat Milling Blades compatible with NutriBullet 900W. Not original NutriBullet products Guarantee: If you are buying before or after purchase any questions, please feel free to contact us