To understand the true value of a Pelikan, you have to understand its internal writing system. By inventing the differential piston filled ink system for the fountain pen, filling is clean and easy while still guaranteeing a steady inkflow. The 14kt gold nib of the 400 fountain pen is engineered to within 1/1000 of an inch. The 400 Ball Pen and 0.7mm Pencil have easy one handed push button mechanisms while the roller refill is the smoothest in its class.