It can be cleaned quickly and efficiently through both dishwasher and hand washing. With good sealing performance, this airlock lid prevents air from entering the bottle to ensure that food does not become moldy and eliminates risk of contamination without any daily maintenance. Made of high-quality food-grade silicone and stainless steel material, it contains no BPA, which is odorless and safe. The diameter of single lid is approx 8.4cm. It fits for all kinds of wide mouth mason jars and other canning supplies and fermenter that is 3.35 inch in diameter. Item Name: Fermenting Lid Material:Stainless Steel,Silicone Size Details: Single Lid Diameter: 8.4cm/3.30" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 5 X Fermenting Lids with Steel Rings (Others Not Included) or 5 X Fermenting Lids (Others Not Included)