How Small a Rose Can Be?

Back in a year, I bought this potted rose in Jusco supermarket. And yes, it grows. Usually what's in my mind, the plant will only serve as a temporary decoration in our living room not more than 1 week. With the difference in temperature, the lovely rose will not live longer than others.
Well, with my love and care that shower it, it's been moving from indoor to shaded spot, and now under the direct exploration of the sunlight. Though it's a bit weak, but yet alive(or survive :P) and blooming.
How I call it small? Try to count the number of petals in the picture, you'll know it.

p/s: It's countable within 10 seconds :P