A crown cap, configured based on a sheet with a circular body perimetrally presenting, after being adjusted to the rim of the mouth of a bottle, a plurality of folds. The sheet has an extension that extends from the circular body and a first transverse folding line to determine a folded arm with two sections, an upper, external section that extends from the circular body followed by a lower, internal section, located between the external or front section and the bottle. The extension also has a continuous cut on the external section that determines a flap with an inverted U-shaped surface, the continuous cut allowing the flap to bend out of a plane of the external section so that during removal of the cap from the bottle, a distal end of the flap engages an area where the extension extends from the circular body.