There are three types of implants currently available. However, only one, the Mentor saline-filled testicular implant has received approval from the FDA for implantation as a testicular prosthesis. The other two, Silimed’s Silicone Elastomer device and Mentopr’s Soft-Soloid Device are also available for implantation for past removal of testis. Only the Elist Prosthesis has been used for testicular enlargement with existing, functioning testicles.