Abstract: A closure cap made of a plastic. The closure cap includes a cylindrical shell which has a lateral outer surface and a vertical axis of rotation, and wings which are arranged to protrude from the lateral outer surface and which are fastened on diametrically opposite sides of the cylindrical shell. Each of the wings transitions from a wing fastening region, which is arranged close to the cylindrical shell, into an actuation region, which adjoins the wing fastening region and which is arranged radially further distant from the cylindrical shell. The actuation region serves for a manual actuation of the closure cap. The wing fastening regions are arranged, with respect to both sides of a central plane which runs through the cap axis of rotation, rotationally symmetrical with respect to the cap axis of rotation.