containing this product there is therefore a passage of the product through the chamber 12 which enters through the bore 14 gets around the magnetized ball 16 which rises while remaining stopped by its inner relief 18 and raises at the same time the application ball 8 which is detached from the circular boss 10 in order to allow the passage of this product outwards following the arrows f while being held in its housing 6 by the magnetization an application head 2 which allows obtaining a closed outlet orifice of the care product when the operator is performing the application is thus performed in a simple and effective manner as well as an open orifice when he she stops this application allowing some outlet of the product coming underneath the application ball 8 which will then be distributed on this ball then on the surface to be treated in the subsequent applications the application head 2 includes few parts which provides good reliability as well as an economical realization generally the application ball 8 may be made of ferritic steel in order to be attracted by a magnet or of a mixture of ferritic and austenitic steel in order to take advantages besides the stainless properties of the latter the ball application 8 may also be protected from the environment by a surface treatment such as a varnish a painting or a plastic layer in order to prevent any chemical reaction with the cosmetic product in particular the application ball 8 made of metal can provide a cooling effect in contact with the skin thus allowing a decongestion of the sensitive parts of the skin to be treated furthermore the application ball.