Our silicone butt plugs are medical grade silicone and our standard metal plug is a chrome plated aluminum alloy. We do offer 304 stainless plugs as well as an upgrade so please reach out if that is something you would prefer. We take allergies very seriously so if you are unsure if any of the products on this site would cause a reaction for you please DO NOT purchase the items. While we appreciate your consideration of shopping with us, your safety is always the most important thing to us. Please feel free to reach out with any questions at info@vuzara.com