the second guiding surface 24 the projection 23 comprises a locking protrusion 26 e g a flange 26 on its internal surface the locking protrusion 26 has a curved outer surface profile in a plane substantially parallel to the pivot axis x and is configured to be fastened in the groove 11 e g snap fastened so as to enable reversible locking of the pivotal movement for example the locking protrusion 26 may be in the form of a grain of rice on the external surface of the projection 23 an indicator 27 e g an arrow may be provided for indicating a prescribed pivoting direction of the second portion 20 for opening of the case from the closed position the second portion 20 includes an annular skirt 29 extending from the upper surface of the bottom 21 the annular skirt 29 is separated by a distance from the peripheral edge of bottom 21 the annular skirt 29 in combination with the bottom 21 defines a second housing 30 the second housing 30 is designed to receive a product e g a blush a eye shadow a rouge etc to be applied the product may be supplied in a container 31 e g a cup configured to contain the product the container 31 may be bonded to or snap fastened with the second housing 30 the external surface of the annular skirt 29 comprises a screw thread 32 configured to cooperate with a corresponding screw.