Urban Decay - Grind House <3 The counterpart to the entire 24/7 eye liner pencil collection. As soon as you fall in love with the liners, you should invest in this sharpener. It is designed perfectly for the 24/7 pencil's unique shape & creamy formula, and will help you get the most out of your product. I've tried using other sharpeners on my 24/7 eye liner pencils before and it always breaks the tip and "eats" up the pencil! The whole line is fab, but you definitely need the grindouse!