4x6 inches. Gouache on paper mounted to board.  Dahlias found in the Mendocino Coast Botanical Garden. Reference provided by Vanessa Walsh.
 
Magnetic strip added to the back to be able to adhere to any magnetic surface!  Try putting magnetic paper on a panel that you can then frame. Buy a few, and swap them whenever you want!
 
Note: Shown framed here for demonstration purposes. Frame not provided.