Package includes: 10 pieces of silicone grommets and 5 pieces of plastic airlocks, sufficient for your use and replacement. Material: The airlocks are made of PP plastic, and the grommets are made of silicone. Durable, soft, and safe for long-term use. Good seal: Easy to use. Drill a suitable hole in your fermenter lid (matching the air valve size), insert the black grommet into the lid hole, and place the tapered tip of the airlock into the grommet for a secure seal. Easy to clean: Practical design allows disassembly for thorough cleaning. Use a small brush to clean completely and disinfect in bleach water if needed. Main function: This airlock kit is a versatile fermenting accessory suitable for various applications such as food preservation, fermenting cabbage, sauerkraut, grapes, brewing beer, wine, mead, and more. Specifications: Seal ring inner diameter: 8mm Material: Plastic + Silicone Color: As shown Package contents: 5 x Three-piece check valves (11.5cm) 10 x Seal rings Only the above items are included; other items are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error is +/- 1-3cm.