Very cool mascara! This is a great idea for a double use in one package. The thinner opening is great for lower lashes and really separating and combing out any clumps. The thicker opening is perfect for really coating the lashes with product. My only complaint is that the thick opening is just a little bit too thick and has a little too much product on it for my liking. I tend to end up with some smudges on my browbone, but it's nothing a simple cotton swab won't clean up!