The Good Blue Nibs Blue The O-ring around the coupler

The O-ring around the coupler provides an air-tight seal and prevents ink from leaking out

Title: Color

With a great fountain pen

are delicate flecks of silver that resemble a constellation of stars across a clear night sky

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The Good Blue Nibs Blue The O-ring around the couplerMaybe you want to try a different nib in your R615 fountain pen. Or sadly, something bad has happened to the nib unit that shipped with your pen. Or maybe you just like our nibs so much that you want one to use in your favourite pen. As it may be. Our nib units feature standard #6 size nibs, and precision engineered feeds that are tuned to be wet they can keep up with the ink flow demands of flex nibs. We designed them to be used in our flex fountain