TWSBI ECO Cosmo w/Onyx Fountain Pen

Marsoni

M251S

$85.00

Get it in 3 business days with 1 day shipping. Friday, May 29

TWSBI ECO Cosmo w/Onyx Fountain PenTWSBI fountain pens are beloved for their clear barrels (sometimes called demonstrators) that allow users to see the ink inside. The pen has an interior ink filling piston system that holds much more ink than a typical fountain pen cartridge. It also allows you to fill your pen up with ink without the use of a converter. Just unscrew the cap at the end of the pen, dip the pen into ink, fill, and screw the cap back on. The TWSBI ECO (for "Economical")

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I do not buy Cover Girl products, but took a chance on this. I am happy I did. This is a nice eyebrow pencil, for a drugstore brand. It does not have the Cover Girl smell. The color was fine for me. It most certainly does not last 24 hours though. I've no idea why the company is allowed to use that in the name.

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Reviewed in the United States on December 1, 2025

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Anna

Boise, US

★★★★★ 5

Great brows done easily.

Color: Soft Brown, Size: 1 Count (Pack of 1)

Very easy to use and lasts well.

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Reviewed in the United States on December 30, 2025

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lynn

Charlottesville, US

★★★★★ 4

Well worth the price

Color: Honey Brown, Size: 1 Count (Pack of 1)

A bit lighter than expected but created realistic looking brow hair

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Reviewed in the United States on February 20, 2026

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Amazon Customer

New York, US

★★★★★ 5

Ease of use nice color

Color: Soft Brown, Size: 1 Count (Pack of 1)

Goes on nicely easy to correct a mistake

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Reviewed in the United States on November 30, 2025

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4bonbon

Belleville, US

★★★★★ 1

Tip will not stay saturated with color

Color: Honey Brown, Size: 1 Count (Pack of 1)

This is a pen with a nice felt tip. First time I used it, it glided on nicely. Second time used about it a week later, tip was dry and no matter how I tried, it would not saturate and provided no color. I even tried storing it with the tip facing down to make the color flood to the tip, but even after several days of standing it up that way, tip was still dry. What a waste of money. I just ordered their Easy Brow and Fill Tool, which is a stick of color that winds in and out and so far like it very much. Would recommend that and not this ink pen.

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Reviewed in the United States on November 30, 2022