In general, we could say that round breast implants are fluid silicone or saline-filled implants that have a round shape (like the name implies) with a smooth shell. They are completely symmetrical and are the most used kind of implants to date.
On the other hand, teardrop shaped implants (also called TDI or anatomical implants) mimic the breast’s natural shape. They are smaller at the top and fuller at the bottom, so they are completely asymmetrical.
These implants are made of a thicker silicone gel or high cohesion gel that holds its shape, with the benefit of feeling soft to the touch. They are also known as gummy bear implants!