The Fountain K is a compact, machined fountain pen that comes in aluminum, brass, and copper. The Fountain K uses German-made Bock nib assemblies known for their quality and long life. Also included with each pen is a Schmidt K5 cartridge converter and 5 black Monteverde short international ink cartridges. The thread-on cap uses triple-start threads to securely attach itself to the pen and to allow the removal of the cap with only 1.5 revolutions. The Fountain K uses the same bulletproof stainless steel clip and screws as do other Karas Pen Co. pens so you don't have to worry about breaking your clip like you do with most fountain pens. Designed and manufactured in the USA.