I have, I don't know, 100 or more nail polishes and can tell you that you do NOT know exactly what the color is just by looking at the bottle. Also, colors look different on your skin throughout the year. Something that looks good on pale winter skin will look different with a tan. These handy little wheels let you paint a few coats on and have a swatch of colors to go back to any time. I'll break out my wheels, pick a color family that I want to use (like metallics or nudes, etc) and hold it up to my fingers or toes to see which one looks best with my skin tone at the time. Instead of having to test out colors and use nail polish remover over and over until I find the one I'm looking for (which totally dries out my nails), this makes it way easier. And they're next to nothing in cost and you get 10 at a time. Super fun!
