If you enroll for a 5-day trial of USMLE-Rx, you will be given a limited preview of Rx Bricks. However, Rx Bricks is not a part of the Rx360 package.
You will see Rx Bricks listed below the Dashboard in the menu.
When you select a Collection (for example, Respiratory), you will see a Table of Contents that shows all of the bricks contained in that collection.
If the brick in the list doesn't have a lock next to it, you will be able to see the full brick.
Keep in mind that if you decide to only purchase Rx Bricks, you will not have access to any of the other products included in the trial, including Qmax, Flash Facts, or Express Videos. The Go Deeper section includes links to relevant material from these products, but you will need to have active subscriptions to those products to view them.