There are two basic types of breast implants: Saline and Silicone Gel.
Saline-filled implants are silicone shells filled with sterile salt water (saline). Some are pre-filled and others are filled during the implant operation. Silicone gelfilled implants are silicone shells filled with a plastic gel (silicone). Although many women say that silicone gel implants feel more like real breasts than saline, they pose more of a risk if they leak. Both saline and silicone come in different sizes and have either smooth or textured shells. Each has its own pros and cons, so it is a matter of preference.