This paper deals with the improvements in rubber mixing over other four-wing rotor designs caused by the advanced design of the patented four-wing N rotor. Information and comparative data will be presented to show how this rotor design improves various mixing parameters such as batch cycle time, Mooney viscosity, batch temperature, intra- and inter-batch temperature uniformity/consistency, material output (pounds/hour) and, where available, other properties of various rubber systems.