The blade assembly includes a precision-hardened stainless steel blade with enclosed double sealed steel ball bearings for maximum durability. The rugged blade assembly literally explodes molecules of food and ice in the container, helping every batch to homogenize more effectively. The blades do not need to be removed for normal cleaning. Advance Blade Assembly for use with Advance containers only. The Blade will not work with any other Vita-Mix containers. - Stainless Steel - Sold per each