KEFIRKO - THE WORLD'S EASIEST HOME KEFIR MAKING SYSTEM - Includes regular (848 ml/28 oz) or large (1,4 l/50 oz) jar, concave glass jar, strainer lid, secure cover lid, citrus juicer attachment, swizzle stick, NEW scraper tool, user guide and recipe booklet. TOP LID The top lid of the KEFIRKO jar enables the airflow needed in kefir-making, and helps to prevent impurities from entering the jar. A measuring cup for the kefir grains is integrated in the top lid. The top lid can also be used as a coaster to keep your kitchen tidy. STRAINER LID Integrated in the strainer lid is a sieve designed with having in mind the thickness of kefir and the size of grains.