Ball Pen

May brush Ball Pen:When you make a mistake by using it,you just need brush is gently,
the mistake will disappear at once and the paper is intact which can come ture by pencil
beforetime.
The Ball Pen bears the following functions:
Writing smoothly by using the Pen which has exquisite handle.
Rubbing away cleanlily by any common eraser.
Writing can't be rubbed away and can be kept forever after four hours.
Writing while during weightlessness status or resupine attitude.
The Pen's using life is twice than common Ball Pen.