Pentel Superb Ballpen BK77. Slimline Ballpen ideal for everyday writing, note-taking and figure work. Features include oil based ink and every time... The classic Superb is the original superior-quality basic ballpoint. Slimline crystal-clear barrel and polished chrome nose stand out from the cheapie alternatives, while the ink is delivered smoothly and cleanly until the last drop. The pen tip is even cleaned each time the cap is replaced. Medium point version adds a ribbed finger grip to the original design. 1.0mm nib writes a 0.5mm line. The Superb Ballpoint Pen Medium, 1.0mm tip, Oil based ink, Black Smooth oil based ink 1.0mm tip, Black Self cleaning tip when cap is replaced