Noodler's Flex Nib Piston Fill Demo Fountain Pen -- Clear Cobalt Blue you are buying ONE Creaper Cobalt Standard Flex Fountain Pen by Noodler's Ink piston-fill mechanism; take any fountain pen bottled ink nib is steel with fine/medium line depending on pressure applied to the nib length closed: 5 1/8"; posted: 5 1/2"; weight: 0.4 oz Instructions on how to use a piston fill fountain pen are included from Noodler's Ink