You can use each one individually, or swirl them together to get shimmer-bronzer.
I chose the lighter of the two shades that were at the store- 01A.
First, I swatched the matte side heavily on my arm so that you could see the color better- it doesn't actually come out this dark with regular use. You can see the bronze section in the middle, and my pale skin on the sides.
Below is the shimmer swatched over the matte bronzer. When I swatched the shimmer alone, it didn't show up on camera. But you can see how it gives the bronzer a nice sheen- it's not sparkly at all, definitely more of a shimmer.
I really like this bronzer- it gives you 3 different options, and tons of product for $7. The powder itself is soft and pigmented- a kabuki brush really picks it up nicely.
Have you tried this bronzer? What did you think?