great [SEP] awesome product concept and easy to do took my cat eyeliner from minutes to seconds to get the symmetry and length and width correct oddly i prefer the longer line and for the first time in liquid lined the under eye with this pen and it was easy and not too heavy since you can do a very thin line i am light hair and it still looked nice the company should make a thin long line cat eye liner too the product is inky and it is not the waterproof style my other fav is eyeko liner or even loreal or lancome for cat eye it is brand no tug is best waterline eyeliner ever plan to buy again