Cap made of synthetic material

A synthetic material stopper, which is configured for mounting on a neck of a receptacle, the stopper comprising:

• a base having an internal circular stopping wall extending toward a lower portion of the stopper, the internal stopping wall configured to enter said neck, the stopping wall defining a first cavity positioned radially inwardly from a threaded surface of the base;
• a safety collar connected to the lower portion of said stopper by a pre-cut line and removably couplable to said neck by retaining means;
• and
• a raised wall extending upward from the stopping wall in a direction away from the safety collar, the raised wall defining a second cavity and forming a portion of the stopper absent threads;
• wherein the stopping wall and the raised wall are of substantially similar heights such that the first cavity and the second cavity form substantially similar volumes, and wherein the second cavity is configured to enlarge the outside surface for gripping said cap, and wherein a circular indentation is formed between the portion radially outwardly from the raised wall and the base, the circular indentation and the raised wall together comprising gripping protrusions.

A synthetic material stopper, which is configured for mounting on a neck of a receptacle, the stopper comprising:

• a base having an internal circular stopping wall extending toward a lower portion of the stopper, the internal stopping wall configured to enter said neck, the stopping wall defining a first internal cavity positioned radially inwardly from a threaded surface of the base;
• a safety collar connected to the lower portion of the stopper by a pre-cut line and removably couplable to said neck by retaining means;
• a raised wall extending upward from the stopping wall in a direction away from the safety collar, the raised wall defining a second internal cavity;
• a plurality of gripping protrusions forming first diametric fins extending radially outwardly from an outer surface of the second cavity, each gripping protrusion having a height equal to the height of the other of the plurality of gripping protrusions, wherein the gripping protrusions extend along the height of the second internal chamber, and wherein the plurality of gripping protrusions enlarge the outside surface for gripping said cap;
• and
• an external surface between the lower portion of the stopper and the non-raised portion of the base, said external surface positioned radially outwardly from the plurality of first diametric fins, the external surface having a plurality of second diametric fins extending radially outwardly therefrom, each of the second diametric fins being longitudinally extended by a respective first diametric fin.