A static mixer for mixing a mass fluid flow includes an elongate body including an open proximal end, an open distal end and an inner wall. At least a portion of the inner wall includes a plurality of undercuts formed therein to define a convoluted conduit. The conduit extends along a central axis between the proximal end and the distal end. A portion of the undercuts defines a center-to-perimeter flow portion within the conduit. A portion of the undercuts defines a perimeter-to-center flow portion within the conduit.