Crafted for wide mouth mason jars, these plastic fermentation lids are designed to your fermenting process. The one-way airlock valve make sure safety and control, while the material maintains the purity of your ingredients. suit for mason jar fermentation supplies, these lids enhance flavor retention and reduce the need for constant monitoring. Features -Color:White -Material:Plastic -Size:13.00X9.00X9.00cm/5.11X3.54X3.54in -Advanced airlock design: these mason jar fermenting accessories feature a oneway airlock valve, ensuring and efficient fermentation process by preventing air contamination -Ideal for wide mouth jars: designed for 86 mm wide mouth mason jar lids, these fermentation lids provide a secure and tight seal for optimal fermenting results - construction: made from premium plastic, these wide mouth plastic fermenting lids are designed for longterm use, making them a reliable choice for fermentation -Preserves : the innovative sealing mechanism of these mason jar fermentation kits make sure that your fermented foods retain their authentic flavors -Simplified process: these plastic fermentation lids for jars reduce the need for frequent lid removal, minimizing air exposure and making the fermentation process easier Package list: 2 x Mason Jars Fermenting Lids