Currently, breast implants that are approved for use in Australia are made of a silicone bag (known as casing, shell or envelope) that is filled with cohesive silicone gel or saline (salt water). In Australia, cohesive silicone gel implants are now the implants of choice. Over the years, technology has advanced significantly, resulting in development of new generation breast implants.

Modern day breast implants are now manufactured under strict quality control with a thicker casing containing the cohesive silicone gel. This thicker silicone casing reduces the chance of gel leakage (gel diffusion), implant rupture and hard capsule formation. The cohesive silicone gel is semi-solid, which does not flow like a liquid when the implant is sliced for demonstration. The gel also feels quite natural like ordinary breast tissue.