A nursing aid system which includes at least one breast cup and at least one nipple extender which may be integrally formed with the breast cup or which may comprise a separate piece. It includes stator and rotor being provided with exciter magnets. The sleeve has a round collar with leaves extending from the collar parallel to the axis of the collar and each other. Furthermore, an RF signal is communicated between the first substrate and the second substrate in a contactless manner through the thick pass-through slot. After that, a second etching is carried out to form an opening further, and thereby a minute opening with an aspect ratio of 13 or higher is made, while suppressing the occurrence of the bowing well. A second housing member is manufactured from a second permeable predetermined material and has a second predetermined size and a second predetermined shape.