The Opus 88 Flow Gray Fountain Pen is generously sized and employs an eyedropper filling system with a piston-operated shut-off valve.

This Fountain Pen follows the eyedropper-style mechanism, requiring you to unscrew the front section to access the pen's interior. With the accompanying eyedropper, fill the pen's barrel with ink and then reattach the section.

Both the cap and the knob at the barrel's end feature a distinctive octagonal shape, ensuring the pen remains securely in place when not in use.

Included in this package are an eyedropper and a stainless steel German nib (Bock #6, Type #250). The barrel is crafted from transparent acrylic, adorned with lively, colourful swirls, and paired with a solid-coloured resin cap. 

Accompanied by a glass eyedropper for effortless ink refills, this pen stands out not only for its appearance but also for its functional design. An ebonite piston and rubber gasket work in tandem to seal off the feed from the barrel, minimizing the potential for leaks and interruptions. To enhance ink flow, simply unscrew the blind cap and slightly loosen the rod at the back of the barrel. For prolonged writing sessions, leaving the shut-off valve open maximizes the substantial ink capacity this pen offers.