In one example, we describe a method and system for facial brush or body brush, for cleaning the skin. A method of fabricating said fiber drum comprises the steps of winding a length of paper sheet in layers, between which an adhesive is applied, to form a roll of the paper sheet having two opening ends, and inwardly curling the edge of at least one of said two opening ends of the roll to form a curled portion before the adhesive is cured between the layers. It also includes a segmentation method to distinguish the foreground, for example an indicator such as a finger, from the background of a computer screen. A mobile country code and a mobile network code corresponding to the RAN are determined based on the retrieved OPC. Embodiments of the dopant coater may include a containment chamber and a coating chamber and the use of an inerting media to control the environment within and around the coater.