The Opus 88 Koloro fountain pen is a truly unique writing instrument. Featuring a sharp alternating material scheme of orange ebonite and resin, this pen’s design stands on its own.
The Koloro is a traditional Japanese style eyedropper-filled pen with a piston operated shut-off valve. An ebonite piston and rubber gasket seals the feed off from the barrel when fully depressed, reducing the risk of leakage and burping. By unscrewing the ebonite blind cap and loosening the rod at the rear of the barrel, you open up the ink flow to the feed. During long writing sessions, leave the shut-off valve open to take advantage of the Koloro’s impressive ink capacity. Having the translucent resin portions of the pen allows you to see both your current ink level and your nib while capped.
The Koloro features chrome hardware and a stainless steel #5 JoWo nib and includes a glass eyedropper to fill the pen with your favorite ink.
This model has been discontinued at Goulet Pens and will not be restocked once sold out.
- Opus 88
- Fountain Pens
Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.
- Body Material
- Ebonite, Resin
- Cap Rotations
For pens with a screw-cap closure, how many rotations it takes to uncap/recap the pen.
- Cap Type
How the cap is opened/closed from the barrel of the pen. Some common options include Snap-Cap, Screw-Cap, Magnetic Cap, or Capless (no cap).
- Compatible inks & refills
Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.
- Bottled inks
- Filling Mechanism
How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.
- Grip Material
- Nib Size
- Extra-Fine, Fine, Medium, Broad
- Nib Color
- Nib Material
Whether or not the cap fits securely onto the back of the barrel when open.
Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).
- Diameter - Body
- 13.8mm (0.5in)
- Diameter - Cap (without clip)
- 15.9mm (0.6in)
- Diameter - Cap (with clip)
- 19.5mm (0.8in)
- Diameter - Grip
Measured from the place most people choose to rest their fingers, which varies with each pen.
- 9.7mm (0.4in)
- Length - Body
The measurement from the back end of the barrel to the tip of the nib.
- 124.7mm (4.9in)
- Length - Cap
- 63.4mm (2.5in)
- Length - Nib
The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.
- 18.1mm (0.7in)
- Length - Overall (Closed)
- 142.5mm (5.6in)
- Length - Overall (Posted)
When the cap of the pen is posted onto the back of the pen body, this is the measurement of the entire pen including the nib.
- 159.8mm (6.3in)
- Weight - Body
- 13g (0.5oz)
- Weight - Cap
- 11g (0.4oz)
- Weight - Overall
- 24g (0.8oz)
- Max Ink Capacity - Eyedropper
The maximum volume of ink that can fit in the pen when filling the entire barrel of the pen via eyedropper.