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Opus 88

Opus 88 Koloro Fountain Pens

Posted in Fountain Pens, Reviews

Taiwanese pen manufacturer Opus 88 is no stranger to the world of writing instruments. The man behind the brand, Michael Hsu, has decades of experience under his belt and OEMs for many other brands over his career. The Opus 88 Koloro is a part of his own private label, and was created because there wasn’t a truly affordable Japanese-style eyedropper pen on the market.

Opus 88 has spent years OEM-ing eyedropper systems for many brands (though for contractual reasons, they are not allowed to disclose specific names). This mechanism is usually reserved for higher end collections like the Maki-e, and comes with a 4 or 5 figure price tag. Certainly not in the reach of affordability for the average Joe.




There are technically 2 versions of the Koloro due to the variation in nib sizes.

The Koloro demonstrator houses a #6 nib instead of the #5 nib found in the coloured models.

The demonstrator also does not have ebonite included in its body, only acrylic.



The pen comes in a black magnetic-closure cardboard box with an outer sleeve.

Opus 88 Koloro Box

opus 88 koloro box



Accompanying each set is an eyedropper tool for the user to load ink with and a set of operating instructions.


Opus 88 Koloro Demo model


Opus 88 Koloro instructions



The Koloro comes in 4 colours and a demonstrator (clear). Now, what the exact colour names are, seems to vary from person to person. The red model has been referred to as red, cinnabar red or red-red. For simplicity’s sake, the colours mentioned here will be red, blue, green, orange/yellow and demonstrator since that was what the invoice listed them as.

The materials used in the construction of the pen’s body are a combination of ebonite and acrylic.

Ebonite (or Vulcanite) these days form the base for Maki-e works, so it comes as a nice surprise to see it being used here. Getting the two to work together was no easy feat as well, taking the company months of revisions to get it right.

Opus 88 Koloro Pen Colours

(left to right) Blue, Green, Red, Orange-Yellow

The green model has tinges of teal, and the ebonite section on the orange-yellow model leans a little to olive in some lighting.

Opus 88 Koloro Demonstrator

Opus 88 Koloro Demonstrator model



Both versions feature a branded German nib (Jowo), with the coloured models having a #5 nib and the demonstrator a #6. It also has a dedicated shutoff valve and central rod mechanism. The screw-on cap takes about 3.5 turns to unscrew, so probably not the best pen for on-the-fly note taking.

The shutoff valve unit is a mechanism traditionally found in Japanese eyedroppered urushi pens. It closes off the ink reservoir chamber to prevent unwanted leakage, making this pen a good one to take on airplanes.

To fill, simply twist the barrel open and use either the included eyedropper or a blunt tip syringe to load up your choice of ink. Both pens have an O-ring so be careful not to lose it!


Opus 88 Koloro Demo


Weight23.8 grams27.1 grams
Length (unposted)14.3cm14.7cm
Length (posted)16cmCannot be posted
Width 1.56cm1.64cm
Body MaterialEbonite and AcrylicAcrylic
FurnishingsSilver chromeMatte Black
Ink Capacity2ml3ml



The demonstrator model overall is a slightly larger pen compared to the coloured ones. For aesthetic and weight balance, a larger #6 nib is used.

opus 88 nib comparison

#5 nib (left) vs #6 nib (right)


Opus 88 Koloro Models

Opus 88 Koloro size comparisons

(left to right) Pilot Vanishing Point, TWSBI Diamond 580AL, Lamy Vista, Lamy 2000, Opus 88 Koloro (blue)


Opus 88 Koloro Demo Comparison

(left to right) Pilot Vanishing Point, TWSBI Diamond 580AL, Lamy Vista, Lamy 2000, Opus 88 Koloro Demonstrator



German nibs generally write one step up from their Japanese counterparts. So it comes at no surprise the Koloro fine nib writes subtly wider than Pilot’s fine nib.

Opus 88 and Pilot Vanishing Point writing comparison

Ink: Kobe #43 Gakuen Toshi Fresh Green



The Koloro definitely delivers what it promises for the price. There were no burping issues nor leakage when we let it roll around in our bag as we ran errands (okay, we stored it in a ziplock bag just in case). Mind you, there was no greasing of the threads involved. There’s no need to do so with the Koloro.


The 4-coloured Koloros retail for U$93/A$120, while the demonstrator model retails for U$120/A$155.


The Opus 88 Koloro pens can be purchased from our online store here.


Opus 88 Koloro Demonstrator with Kobe Ink

February 7, 2018