An actual size picture tries to describe what is mechanically happening inside your anal cavity on a 2D surface. It took me a second to process that myself while looking over this toy. A see-through backside reveals the size and dimensions and the sides offer some care instructions. The "Pleasure Ball" is a steel ball-bearing, free-rolling within an inner chamber of the silicone plug. This feature is the selling point behind this toy. It most certainly added a unique element to backdoor play.
We used a water-based lube for insertion and found no problems in that area. The bulb is well suited for all adventurers and those curious about it. Movement while inserted was interesting due to the pleasure ball. You will notice the small pressure changes as you shift around switching up your normal sensation. This toy adds just enough flair to be unique yet remains founded in its function.