are connected to each other a tip holder 7 inserted a third ink supply rod 5 is fitted to the second bore 2e at its anterior end the third ink supply rod 5 is connected to the second ink supply rod 4 the cylindrical shell 2 2 is smaller than the main body 2 1 in diameter the anterior end of the shell 2 2 constitutes a writing tip the posterior end thereof is provided with an annular flange 2f having an air hole 2g the cylindrical shell 2 2 thus formed is inserted into the anterior end of the pen barrel 9 thereby to constitute a pen body to ensure correct insertion an annular ridge is formed on the inner surface of the anterior end of the pen barrel the following description relates to the connection of the three different ink supply rods in combination with the flow regulator 2 the first ink supply rod 3 is inserted into the center bore 2d and is communicated with at its posterior end the ink reservoir 6 and at its anterior end with the second ink supply rod 4 inserted into the second bore 2e the second ink supply rod 4 is connected at its anterior end to the third ink supply rod 5 secured in the tip holder 7 thus the first second and third ink supply rods are connected in series in the pen body ink in the reservoir 6 rises initially through the first ink supply.