Method for making an object with a polymeric material, said object being provided with a main body, a first visible surface and a second visible surface opposite said first visible surface, the method comprising the following steps: - preparing a first half mould configured according to the shape of said first visible surface of said object and a second half mould facing said first half mould and configured according to the shape of said second visible surface of said object; - positioning a first insert made of a polymeric material in contact with said first half mould and maintaining said first insert in contact with said first half mould by charging said first insert electrostatically; - positioning a second insert made of a polymeric material in contact with said second half mould and maintaining said second insert in contact with said second half mould by charging said second insert electrostatically; - closing said half moulds (60, 70) so as to define a cavity; - injecting a polymeric material at a predetermined temperature in said cavity, said polymeric material being suited to fill said cavity in such a way as to define said main body of said object and suited to be placed in contact with said first insert and said second insert; - letting said polymeric material cool down; - opening said half moulds (60, 70) and extracting said object, characterized in that head zones (20a, 22a) of the first insert and/or of the second insert are bevelled and they are not perpendicular to the advance direction of the material, and in that, during said step of injection of said polymeric material, the polymeric material that makes up said main body pushes said first insert against the first half mould and/or the polymeric material pushes said second insert against the second half mould. - preparing a first half mould configured according to the shape of said first visible surface of said object and a second half mould facing said first half mould and configured according to the shape of said second visible surface of said object; - positioning a first insert made of a polymeric material in contact with said first half mould and maintaining said first insert in contact with said first half mould by charging said first insert electrostatically; - positioning a second insert made of a polymeric material in contact with said second half mould and maintaining said second insert in contact with said second half mould by charging said second insert electrostatically; - closing said half moulds (60, 70) so as to define a cavity; - injecting a polymeric material at a predetermined temperature in said cavity, said polymeric material being suited to fill said cavity in such a way as to define said main body of said object and suited to be placed in contact with said first insert and said second insert; - letting said polymeric material cool down; - opening said half moulds (60, 70) and extracting said object, characterized in that head zones (20a, 22a) of the first insert and/or of the second insert are bevelled and they are not perpendicular to the advance direction of the material, and in that, during said step of injection of said polymeric material, the polymeric material that makes up said main body pushes said first insert against the first half mould and/or the polymeric material pushes said second insert against the second half mould. characterized in that head zones (20a, 22a) of the first insert and/or of the second insert are bevelled and they are not perpendicular to the advance direction of the material, and in that, during said step of injection of said polymeric material, the polymeric material that makes up said main body pushes said first insert against the first half mould and/or the polymeric material pushes said second insert against the second half mould.