A method of making a razor blade unit is provided. The method includes the steps of: providing a plastic base member; providing a plastic upper member, the plastic upper member having a first surface and an opening in the first surface; securing a shaving aid member to the first surface of the upper member, the shaving aid completely surrounding the opening; inserting at least one razor blade between the plastic base member and the plastic upper member; and securing the plastic base member to the plastic upper member creating a plastic body having the at least one razor blade disposed in the plastic body.