The Opus 88 Flow fountain pen is a large eyedropper-filled pen with a piston operated shut-off valve. The barrel is made of transparent acrylic with playful colored swirls and a solid colored resin cap. The cap and piston knob are octagonal shaped and features a silver stainless steel Bock nib in Extra Fine, Fine, Medium, Broad or 2.3mm Stub.. It also comes with a glass eyedropper to fill the pen with your favorite ink. An ebonite piston and rubber gasket seals the feed off from the barrel when fully depressed, reducing the risk of leakage and burping. By unscrewing the blind cap and loosening the rod at the rear of the barrel, you open up the ink flow to the feed. During long writing sessions, leave the shut-off valve open to take advantage of the impressive ink capacity.
Opus 88 is a Taiwanese company. The name Opus was choosen because the company tries to tell the pen user that they are good in using different materials to create pens (materials like brass, wood, shell, sterling silver, acrylic, ebonite, etc.). The number 88 is a reference to the year the company was founded. The symbols in the logo are the Chinese word fort he family name of the company ‘’Hsu’’.