Re-closable vial for the containment of a product either fluid, powdery or colloidal, particularly a cosmetic, medicinal or pharmaceutical product, comprising: - at least a containment body including a cavity for containing the product, which containment body has an extremity with a neck; and - closing means comprising at least a shutter element, which can be associated with said neck so as to close the cavity; said containment body and said shutter element being made in a single body piece in an elastically deformable material, with said shutter element that is removable by tearing off from said containment body so as to define, in correspondence to said neck, a dispensing mouth communicating with said cavity and suitable for allowing the dispensing of the product; wherein: - said cavity includes a cylindrical passage which originates from said dispensing mouth and extends within said neck, said passage having its own span; - said shutter element comprises a pin having an engagement portion, with a cylindrical side surface which defines a maximum transversal dimension of said pin, said engagement portion having a bigger transversal section than said span in such a way that said engagement portion can be inserted into said passage, through said dispensing mouth, coupling by interference with said neck, so as to close said dispensing mouth in a removable way; and - said neck comprises a distal portion which includes the dispensing mouth in correspondence to one free extremity of said neck, and which has a side wall defined between the cylindrical inner surface of said passage and an opposite outer surface, tapered in the direction of said dispensing mouth, so that said neck has minimum transversal dimensions in correspondence to said free extremity; characterized in that: - said tapered distal portion has a substantially truncated-cone shaped surface; - said passage has a transversal section with a diameter between 2.7 mm and 2.9 mm; and - said free extremity of the neck including said dispensing mouth has a periphery defined by a circumference, the diameter of which has a length between 2.9 mm and 3.1 mm so as to be able to dispense calibrated drops of product. - at least a containment body including a cavity for containing the product, which containment body has an extremity with a neck; and - closing means comprising at least a shutter element, which can be associated with said neck so as to close the cavity; - said cavity includes a cylindrical passage which originates from said dispensing mouth and extends within said neck, said passage having its own span; - said shutter element comprises a pin having an engagement portion, with a cylindrical side surface which defines a maximum transversal dimension of said pin, said engagement portion having a bigger transversal section than said span in such a way that said engagement portion can be inserted into said passage, through said dispensing mouth, coupling by interference with said neck, so as to close said dispensing mouth in a removable way; and - said neck comprises a distal portion which includes the dispensing mouth in correspondence to one free extremity of said neck, and which has a side wall defined between the cylindrical inner surface of said passage and an opposite outer surface, tapered in the direction of said dispensing mouth, so that said neck has minimum transversal dimensions in correspondence to said free extremity; - said tapered distal portion has a substantially truncated-cone shaped surface; - said passage has a transversal section with a diameter between 2.7 mm and 2.9 mm; and - said free extremity of the neck including said dispensing mouth has a periphery defined by a circumference, the diameter of which has a length between 2.9 mm and 3.1 mm so as to be able to dispense calibrated drops of product.