The NATRELLE® 133 Tissue Expander is used for temporary subcutaneous implantation and requires periodic incremental inflation using sterile saline for injections until the required amount of tissue is formed. NATRELLE® 133 Tissue Dilator is made of silicone elastomer and consists of a dilation capsule with a BIOCELL® textured surface and a MAGNA-SITE® integrated injection site. Expanders come in a variety of styles and sizes to meet a variety of surgical needs.