The Neutrocork 38 x 23 mm Number 9 Cork - 100Count 6204B are manufactured from premium cork granules and hot vapor treated which reduces TCA or Trichloranisole, the main cause of corky, musty tastes in wine. These corks are affordable and won't affect the original flavor of the wine. Ideal for home wine makers and hand bottling. Quality construction and design: Affordable and safe. Will not affect the wine's original flavors.