Asvine V126 Vacuum Filling Fountain Pen Extra Fine Nib, Frosted Clear Acrylic, 14.8cm (5.83in) | Smooth Writer

• Vacuum System-The pen's built-in vacuum filling system holds far more ink than a cartridge and lets you draw ink straight from the bottle, no converter required!
• Easy Filling- Simply untwist the end cap, pull up the piston rod then push down, ink is filled. To use the pen for longer, unscrew the piston knob a few turns to let ink flow from the barrel to the nib.
• Classic Design-The V126 features a modern, eye-catching design, with a frosted transparent body that shows off the pen's inner workings.
• Smooth Writer-- The extra fine nib was made of stainless steel with gold plated which ensures you have a smooth writing experience.
• Premium Acrylic- The pen was made of premium acrylic for long-term of use. It was equipped with comfort frosted grip for your long-time writing.

• Unscrew the pen's end cap (piston knob). Ensure you have your preferred bottled fountain pen ink ready. Do not insert any cartridges. — Prepare for Filling
• Submerge the nib in your ink bottle. Pull the piston rod up to draw ink into the barrel. Push the rod down to expel air, then pull up again to draw more ink if needed. Repeat until the barrel is sufficiently filled. — Perform Vacuum Fill
• Once filled, unscrew the piston knob slightly (a few turns) to allow ink to flow from the barrel to the nib. This primes the pen for writing. Wipe any excess ink from the nib and section. — Ensure Ink Flow
• Hold the pen at a comfortable angle and begin writing. The extra-fine nib is designed for smooth, consistent lines. If ink flow seems slow, gently unscrew the knob a fraction more. — Begin Writing

Typical situations where Asvine V126 Vacuum Filling Fountain Pen Extra Fine Nib helps — illustrative scenarios, not customer reviews.