What is the name of the fabric ribbon that you use to make dior roses?

It is the pre-made kind. I am assuming that it is cut on the bias. It is a strip that is folded in half and sewn together on one end. I know it can be found at Joann Fabrics stores where you can buy it by the yard but they have limited colors and i would like to know the name of it so i can look up more online. Help?