This is a pen to acquire for its looks. It's small: five and a half inches long and only a quarter of an inch wide at the grip. So it will easily slip into the binding of a spiral notebook for example. A general instruction leaflet is included that doesn't cover this model. By experiment I have found the way to change refills: twist the ball to advance the nib, unscrew the cap at the nib end, pull out the spent refill, push in a new one and reverse the procedure. Not an instrument for prolonged writing, but excellent for note-taking.