DUX 266 FOUNTAIN PEN GOLDEN BARREL GOLDEN CLIP Dux pen of ingenious design and exquisite workmanship Dux 266 is a very elegant looking sturdy pen. The hooded nib is an iridium point nib and more of a fine medium. The pen writes beautifully whether posted or unposted, the lightweight cap doesn't alter the good balance. The pen is very light weight and it is possible to use it for hours.