The invention provides for an ink ejection nozzle for a printhead integrated circuit. The nozzle includes a fluid chamber and a paddle. The fluid chamber has a fluid outlet port and a fluid inlet port respectively defined in opposite walls of the chamber, the chamber having chamber wall edge portions for locating a paddle therebetween. The paddle is located in the chamber between the edge portions, the paddle operatively displaceable to eject ink from the fluid outlet port. The paddle is formed with a series of protrusions in a central portion of the paddle, the protrusions aiding in reducing outward ink flow from the centre of the paddle as the paddle moves towards the outlet port to eject ink via the outlet port.