A spline for use in a windshield wiper assembly including a wiping element is provided. The spline is composed of a pair of elongate strips, and each strip includes a first curved portion having at least one pointed protrusion to penetrate the wiping element, a notched portion having a notch, a second curved portion provided at a side of the elongate strip, and a body portion to seat within the wiping element. An overall shape of the spline is convex or concave with a bottom surface of the spline directed toward a wiping lip of the wiping element.