The Noodler's Nib Creaper Demonstrator fountain pen has a semi-flexible steel nib that allows it to write in a fine to a broad-broad line depending on how much pressure is applied while writing. The nib is tipped with a platinum alloy and when at full flex performs best when writing slowly and deliberately. The body is made of a milky-clear resin with small imperfections. The Noodler's flex nib pen is piston fill with a screw cap and chrome trim. Easy to clean and easy to disassemble. Approx size: 5.25" capped, 5.5" posted, 4.63" without its cap.