The Pelikan Souveran M205 fountain pen in Petrol Marble is a piston filling pen that uses bottled ink only, and features a body of gorgeous marbled pretrol colored celluloid acetate, with a black cap and silver plated trim. The stainless steel nib is a very smooth writer, and does tend to run a bit on the wider side. The Pelikan M205 fountain pen is a mid-sized pen that is comfortable in the hand for most writers.