Use the sturdy, handsome storage case to improve organization in your kitchen. Makes an excellent gift for the fermentation expert in your life. Set includes 4 air locks, 4 sturdy white -on lids for wide mouth jars Begin making tasty, healthy sauerkraut, , ginger carrots, and other fermented foods with safety and ease Silicone gaskets create a tight seal between the lid and the jar, preventing oxygen and dust from contaminating your ferments.