Are you looking to make some anaglyph / calligraphic things or maybe just a fun thing to occupy your children?Don't move, "The pencil twins" is for you!What is it:It allows you to gather two pencils in one. You can mix pens, colours or just use the same pens to have a perfect same trace.It is ergonomic and thought for your fingers, big or small!It’s smart or at least easy. If your pen is stuck inside you don't have to take a hammer to extract it. Simply spread the sides out and your pen will gently slide out.Info:"The pencil twins" is designed to accept pens with a diameter of 10 millimeters.