OPUS 88 Transparent Demonstrator《Medium》 gansai They fit perfectly to the

They fit perfectly to the size of the techo book

Material: Japanese Paper (suitable for most inks/ink pads)

The back has markings at 1mm intervals along the long edge

From Galen: "Our Two Pen  will keep your precious pens from getting scratched

with one side further labeled by millimeter to act as a metric ruler

OPUS 88 Transparent Demonstrator《Medium》 gansai They fit perfectly to theThe Transparent Demo from OPUS 88 is a traditional dropper fountain pen with a clear acrylic body and comfortable weight distribution for easy writing. The knob at the end adjusts the air pressure and ink flow, controlling ink output and airtightness. The pen body and grip can be easily unscrewed for cleaning and refilling. Based in Taiwan, Opus 88 pens has masterfully engineered their pens to serve in both form and function, as well as reflect the