What materials are typically used to create inert winery vessels?

Inert winery vessels are utilized in winemaking to ensure that wines are stored or fermented in conditions that do not impart additional flavors or aromas. Stainless steel is a preferred material for these vessels because it is non-reactive and does not contribute any flavors to the wine, allowing for an unaltered expression of the grape's character. Concrete is also increasingly used due to its thermal properties, which help maintain stable temperatures during fermentation and aging, while still being non-reactive. This combination makes stainless steel and concrete particularly suitable for creating inert winery vessels, as they both serve the purpose of preserving the wine's purity while offering functional advantages in the winemaking process.

Alternative materials like wood or glass do not fit the definition of "inert" as wood can impart flavors and aromas to the wine, and while glass is inert, it is generally not used for large-scale fermentation or storage due to its fragility. Thus, the combination of stainless steel and concrete stands out as the correct answer for materials that create inert winery vessels.