It's a bright highlighter yellow nail polish and is quite close to the color of tennis balls.
The formula's very watery and sheer. In fact, here's three coats.
This here is five coats. There's still a slight visible nail line.
And here, you can see the color in comparison to a tennis ball.
Please note that the color is much brighter and greener than the pictures actually show. Also, when this polish dries, it's almost matte.