Tonymoly Back Eyeliner
Tonymoly's Back Gel Eyeliner line is a gel-formula eyeliner range sold in a handful of tip styles: the original squeeze tube, the firmer "Z" and "Z Jet" builds, a long-brush pen for hairline strokes, and a High-tech Flat Liner with a flat felt tip. Shades run black and brown, tube sizes span 1.2g to 7g, and the Z Jet 4g comes EYE VEGAN certified. Pick a tip style by the line you want to draw: brush for a soft smudge, flat tip for a crisp wing.
By Skinsli editorial Updated
Buying guide
Tonymoly Back Gel Eyeliner buying guide
Back Gel Eyeliner is Tonymoly's gel-liner line, built around one core formula in a few different applicator shapes. This guide walks through the tip styles, the Z and Z Jet variants, shade options, and tube sizes in the current skinsli assortment so you can pick the version that matches how you actually line your eyes.
What Back Gel Eyeliner is
Back Gel Eyeliner is a squeeze-tube gel eyeliner: a pigmented gel dispensed through a fine metal tip rather than a liquid brush or a wax pencil. The gel format sits between a pencil and a liquid liner — it glides on soft like a pencil but sets with more definition than most kohl sticks.
Tip styles in the line
The assortment covers three applicator shapes:
- Standard tube — the original fine-tip gel liner in 4g.
- Long Brush — a pen-style brush tip for hairline, feathered strokes.
- High-tech Flat Liner — a flat felt tip in a compact 1.2g size for a crisp winged edge.
Z and Z Jet versus the original
The Z and Z Jet builds are firmer reformulations of the same gel liner, sold in 4g and 7g tubes. The Z Jet 4g is the EYE VEGAN certified version in the line, so it's the pick if a vegan formula matters to you.
Shade options
Black is the core shade across the line, including the Long Brush No.1 Black. Brown ships as the Long Brush No.2, a softer alternative for a more natural lower-lash line or daytime look.
Tube sizes
Sizes run from the compact 1.2g Flat Liner up to the 4g standard and Long Brush tubes, with a larger 7g Z tube for anyone who goes through liner fast. The Long Brush No.1 Black is also sold as a 3-piece set for stocking up.
How to apply it
Draw close to the lash line in short strokes, building up thickness in a second pass if you want a bolder line. The Long Brush tip is easier to control for a thin, precise line; the flat tip on the High-tech Flat Liner is built for a straighter wing without repeated touch-ups.
Choosing between the versions
If you want the simplest option, the standard 4g tube in black covers most everyday looks. Reach for the Long Brush if you prefer brush control over a tube tip, the Flat Liner for a graphic wing, and the Z Jet 4g if a vegan-certified formula is a requirement.
FAQ
Frequently asked questions
FAQ
Frequently asked questions
What is Tonymoly Back Gel Eyeliner?
It's a squeeze-tube gel eyeliner from Tonymoly, dispensed through a fine metal tip. The gel glides on softer than a pencil but holds its line better than most liquid liners.
What's the difference between the standard tube and the Long Brush version?
The standard tube uses a fine metal tip, while the Long Brush swaps that for a pen-style brush applicator, which gives more control for thin, feathered strokes along the lash line.
How is the Z Jet different from the original Back Gel Eyeliner?
Z and Z Jet are firmer reformulations of the same gel, sold in 4g and 7g sizes. The Z Jet 4g is also the EYE VEGAN certified version in the line.
Is any Back Gel Eyeliner vegan-certified?
Yes — the Back Gel Eyeliner Z Jet 4g carries EYE VEGAN certification. It's the version to pick if a vegan-certified formula matters to you.
What shades does the Back Gel Eyeliner line come in?
Black is the core shade across the line, and the Long Brush version also comes in a No.2 Brown for a softer, more natural line.
What sizes does the Back Gel Eyeliner come in?
Sizes range from the compact 1.2g High-tech Flat Liner up to the 4g standard and Long Brush tubes, with a 7g Z tube for heavier use.
How do you apply Tonymoly Back Gel Eyeliner?
Draw close to the lash line in short strokes, layering a second pass for a bolder line. The Long Brush tip gives finer control; the flat tip on the High-tech Flat Liner is built for a straighter wing.
Can I buy the Long Brush Back Gel Eyeliner as a multipack?
Yes — the Long Brush No.1 Black is available both as a single piece and as a 3-piece set.