A simple click of a button and...you're ready to write... The Sheaffer® Sentinel® features a convenient push-button mechanism that allows you to activate the tip of the pen instantly. It's so easy that you can even do it with one hand behind your back. The Sentinel® fits into virtually any portfolio or pocket calendar, making it perfect for practical everyday use. Its classic slim profile allows for a pleasurable writing experience, whether you choose the ballpoint or pencil. With a wide range of finishes, the Sentinel's appeal is broad. Consider it an excellent gift for the student, professional... or professional student.