Lake Baikal Acrylic Konrad Flex Nib Piston Fill Fountain Pen by Noodler's Ink you are buying ONE Lake Baikal Acrylic Konrad Flex Nib Piston Fill Fountain Pen piston-fill mechanism; takes any fountain pen bottled ink steel flex nib: described by Noodler's Ink as a fine/medium depending upon pressure placed when writing length closed: 5 3/4"; posted: 6"; weight: 0.6 oz