The Kilner® Set of 2 Fermentation Jars 1 Litre provides the easy way to create smaller batches of your own delicious fermented foods packed with vitamins, minerals and probiotic cultures.The silicone valve in the lid will release the gas that builds up inside the jar during the fermentation process, whilst also blocking the air from entering the jar, which usually causes foods to go mouldy. Perfect for creating live cultures of sauerkraut, kimchi, pickles and much more. Creating your own fermented foods is straight forward, just add your favorite vegetables, water and salt.Kilner® is dedicated to using sustainable and durable materials. Kilner® glass is 100% kerb side recyclable and is the safest and best option for storing food and drink.Set includes: 2 x Kilner® 1 Litre Kilner® Jars, 2 x Kilner® Glass Weights, 2 x Stainless Steel lids with silicone valves & 1 x Recipe Booklet