Multi-shaft mixers have a center mounted low speed helical or anchor blades, which sweep the mixing vessel wall and one or more high-speed dispersion shafts to insure proper dispersion. Multi-shaft mixers are most often used to mix medium to very high viscosity products. The high-speed shaft provides shear to disperse or dissolve ingredients. The low speed feeds the dispersion blade by blending and folding the mass in the vessel to improve product uniformity.