a winding bobbin for receiving elongated winding material , in particular metal - containing winding material , comprises a winding core having two flanges arranged thereon and which is preferably made of plastic . at least one flange is removable whereby locking elements are provided for locking the flange on a winding core , ensuring a stable connection between the flange and the winding core in the axial direction . preferably , a locking element is provided to prevent the removable flange from being unintentionally loosened from the winding core .