Premium Quality : Designed for 3.38 inch wide mouth mason jars , this product is made of 304 stainless steel . It resists rust and contains no adhesives or glues Leak Proof Seal : This mason jar lid locks tightly to keep contents fresh . Its sealed design preserves flavors and blocks fridge odors , making it ideal for storing leftover smoothies , juices , and salad dressings Wide Mouth Mason Jar Pour Lid : Our lid fits wide mouth mason jars , converting them into versatile pitchers that can be applied to pour and store various liquids and foods , ideal for airtight storage of milk , iced tea , iced coffee , cereal , and juices 4 Piece Set : You will receive 4 flip top pour lids for mason jars , which can seal mason jars securely . The ample quantity meets daily household needs : use them to store food or liquids , or to make fermented fruit beverages at home Wide Application : These mason jar pour lids are essential tools for homes , kitchens , restaurants , cafes , bars , indoor cooking , and outdoor barbecues