A yogurt lover's essential, the extra set of eight 6-oz. glass jars allows for making up to seven different types of yogurt at one time. No need to finish the first batch before starting another! For use with our YMX650, YM100 and YM80 Yogurt Maker, these 6-oz. glass jars feature a BPA Free freshness dating system lids that allows you to note the yogurt's made-on date.