There are several types of breast implants available for use. The main difference between the types is the filling within. The two options approved by the FDA in the United States to be in use are silicone-filled implants and saline filled implants. Each of these choices comes in a variety of sizes. There are also several shapes common in these implants. Some have a textured shell to them while others have a smooth shell. Some are full with a thicker filling, called a high strength cohesive implant or more commonly known as a gummy bear breast implant. This particular type of implant is still under investigation for its safeness.