KWZ Standard ink bottle 60mL - Turquoise Watercolor Stonebook They are known as "D"

They are known as "D" bottle pen inks

The Eclipse Black Gold uses a piston-filling mechanism

Place the nib

The 580 features a larger ink capacity with the piston filling mechanism and a smoother operating cap

Pilot Kakuno fountain pen is an entry level pen

KWZ Standard ink bottle 60mL - Turquoise Watercolor Stonebook They are known as "D"The KWZ Standard ink bottle 60mL Turquoise KWZ Standard ink is meticulously crafted to exhibit distinct colors and characteristics that distinguish it from other inks available. Each ink is precisely formulated with raw chemicals to create a premium fountain pen ink with unbeatable quality. wet ink, low shading UV resistant glass bottle (to preserve quality) 60mL Hand made in Poland