Instructions: First show the ball pen and a dollar bill. (You can also borrow paper money from the audience). Then put the cap on the pen body and show the pen head, at the same time press the cap to make the magnetic pen head come out of the barrel. Then show the ball pen to penetrate the bill. (The key point is making sure the audience can’t see you put the ball pen head under the bill). Magically remove the ball pen from the bill leaving no holes. Hand both the ball pen and bill out for total examination .