This extremely interesting looking thing is NYX's answer to the eternal difficulty of doing perfect liquid liner. It found its way into my basket when I was browsing NYX's UK site for unnecessary that given my lipstick drawer is overflowing essential new lip products and I'll admit I added it mostly because it's quite unusual.
The contents of the pen is an intense black liner which doesn't smudge and lasts up to 14 hours. That's not a particularly new thing in the beauty world: you can find liners of this caliber from a great many brands. The shape of the pen, though, is very innovative - it's curved, ergonomically designed, to help you maintain the steadiest of hands, aiding in the drawing of perfectly smooth liquid liner.
It's held like a gun, with the forefinger along the top of the curved pen, and the thumb gripping the side. This position is comfortable, and enables me to run the liner smoothly and easily across my lashline, easily creating a thin or thick line with ease.
I'm incredibly impressed with this tool - it makes liquid liner so easy. I don't personally struggle with felt tip or liquid liner so long as I take it slowly, but this tool makes it so easy I can apply it within a few seconds. It's so much easier to use than the traditional cylindrical pen format. I'd definitely repurchase, and would highly recommend the Curve to anyone who finds liquid liner a little bit of a faff.
Find it at the NYX website, where it'll cost you £12.50 - not cheap, but certainly not expensive for such a useful and unusual product.