An excellent brush for eyeliner or any other application that needs precision.  The brush is perfect for applying a gel/cream eyeliner since it’s hard. One can make very straight lines. I use it damp to apply eyeshadow as an eyeliner, too. It’s also handy to apply a fine line eyeshadow on the lower lash line carefully or an illuminating one in the middle of the lower lash line. Its shape makes it perfect to apply gel/cream eyeliner in between the lower lashes with the tip. It makes them look fuller naturally without a harsher full eyeliner line and works particularly well if one doesn’t apply mascara on the lower lash line.

I use this with an eyebrow gel and it works well

This is the perfect brush to use with pots of gel-type eyeliner, worth the price. The others I've tried have been too floppy to make precise lines.