Embodiments are directed towards providing a device and method of identifying media items from a media library maintained by a media server that are similar to a designated media item. An ink jet printer is used to apply micro drops of a basic chemical solution that insolubilizes the affected areas of the coating to a developing solution. The body part and the protruded part of the sensor core forms an open magnetic path, and a stepped part is formed on a side face of at least one piece of the protruded part. The plurality of blades are located on the blade support member, and move in a cutting direction towards a hair to be cut.