http://www.bodyartforms.com/materials.aspImplant grade silicone is entirely safe for body piercing use and is great for people with metal allergies or sensitivities.
* Wash with antibacterial soap and warm water before inserting into your piercing.
* Use lubricant before inserting or removing silicone eyelets/plugs. This will help reduce chance of tearing.
* Silicone jewelry CAN be autoclaved.
* Never soak in or use harsh chemicals such as alcohol.
* Silicone is not recommended to stretch your piercing. It has been done successfully, but not in all cases. If you want to take the chance and go for it, that's fine. Just be aware that your body could BADLY react to it.