http://www.kitchenu.com/shop/product.aspx?ref=froogle&sku=855#description
where it mentioned stainless. In the detailed desc, it mentions it's tin-lined.
Mauviel's regular copper cookware is stainless + copper
Bourgeat has more tin-lined cookware like chef pans, nowadays it's not common. Top french chefs still use it for making delicate sauces.