Natural corks are made from the bark of the cork oak tree, primarily found in Mediterranean regions. The bark is harvested without harming the tree, allowing it to regenerate and be harvested every nine years. This sustainable process makes cork an eco-friendly choice for sealing bottles, especially for wine. Cork is valued for its unique properties, including being lightweight, buoyant, and impermeable to liquids and gases. These characteristics help preserve the quality of beverages by preventing oxidation. Additionally, natural corks are biodegradable, making them a more environmentally responsible option compared to synthetic alternatives.