These Kilner jars allow you to create smaller batches of your favourite fermented foods packed with vitamins, minerals and probiotic cultures. The silicone valve in the preserve jar lid will release the gas that builds up inside the jar during the fermentation process without letting air enter the jar. Use for live cultures of kimchi, pickles and much more. Set of 2 Contains: 2 x 1 Litre Kilner Preserve Jars 2 x Stainless Steel Lids with Silicone Air Lock Valve 2 x Silicone Rings 2 x One-Piece Lids 2 x Glass Weights 1 x Recipe Booklet H 18.5 x W 24 x D 10 cm