Good Materials: The 32oz strong glass container comes with evenly weighted fermentation stones The wide opening stainless steel cover and food safe pressure release component provide safe, efficient fermentation with consistent long term use Versatile Design: When fermentation finishes, remove the pressure release component and use the included flexible stopper to seal the container for keeping contents Easy action: Fill the pressure release component halfway with water to slowly let fermentation vapors escape while blocking outside air entry Flexible Fermentation Solution: Perfect for making fermented vegetables including kimchi, sauerkraut, brined cucumbers, and similar foods This comprehensive set simplifies fermentation for first time users while maintaining efficiency for experienced makers Complete Fermentation Set: This fermentation collection contains a 32oz glass container, glass weights for fermentation, a designed lid, a pressure release component, a flexible sealing part, and 2 extra sealing parts All required factors for proper fermentation are included in single package