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    BPH

    Interchangeable Tip Pen

    The best interchangeable-tip pen in the world! Before the Razertip BPH, interchangeable-tip pens meant a compromise: either they used a wire-and-post system (like our earlier model ITH pen, no longer available), or you had to buy an expensive tip with a special molded plug (like Colwood) that was not rigid enough for precision work. Say goodbye to compromise!