Colourpop- Crzy Bff Liquid Liner- Deep Sapphire, 0.55 Mlbff liquid liner introducing bff liquid liner, our first ever precision felt tip liquid eyeliner pen. the easy to use, flexible tip glides on smoothly with intense pigmentation in one swipe without skipping or tugging. shes with you from thin to thick, from a sleek wing to a full on cat eye, shell build you up and wont let you down. find a friend that keeps you looking sharp all day, this transfer resistant formula wont smudge, feather or run. net