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OPUS 88 Koloro is a demonstrator and eyedropper pen from Taiwanese manufacturers OPUS 88.

It features the eyedroppe filling system, giving it considerable ink capacity (approaching 4ml). The Opus 88 Koloro features a rod which operates a valve that controls ink flow - it can be shut off completely or used to moderate flow.

It is a mid sized pen, made with translucent material and ebonite sections on the cap.  It can be posted.

This is an extremely well presented quality pen.


Weight (empty) 26 gr

Length capped 142mm

Length open 126mm

Length posted 162mm


OPUS 88 Koloro come from the Taiwan based Opus 88 company. Founded in 1988, they have manufactured high quality OEM pens (i.e. they've made pens for other brands, but not sold under their own brand).