The disclosure provides a blocking element and its use in a protective structure. A dummy structure is formed in the peripheral region of the substrate. The press-side passage is opened at the side wall of the fuel gallery. In response to the computer determining that the mobile device has been misplaced, the computer dynamically identifies, based on the set of contextual information and on the social networking information, one or more contacts associated with the rightful user. The composition makes it possible to obtain good curling of keratinous fibers, such as eyelashes.