These wide mouth mason jar lids are tightly sealed with leak-proof seal and turn mason jar into a drinking bottle,to storage some dry goods or beverage,cold brew coffee,iced tea,lemonade,milk,salad Mason jar lids with removable silicone gasket provide a secure seal to leak proof,easy to use,simply screw the lid on jar and then press flip cap hard for leak-proof.The airtight seal keeps your food fresh The wide mouth mason jar flip cap lids are tightly screwed on mason jars,will never fall off while you are pouring,suitable for ball mason jars and other wide mouth mason jars,but not fit regular mouth mason jars High quality food-grade plastic and silicone material,BPA free,leak proof,flip cap fashion design,dishwasher safe,mason jar pouring lid with a hole for easy to carry and hanging on kitchen,bike,backpack,ect. Canning lids use with wide mouth mason jars to take some food on the go or storage food like beans and oatmeal in your pantry,flip cap good for pouring liquid and used with straw to drinking lemonade,milk,yogurt Airtight Sealed This lid provides and air tight, dependable seal to keep your foods fresh and ensure that it will never leak. Flip Cap Design with a Ring Our flip cap is sturdily attached and will never fall off. The ring on the top are made for easy take out or hanging on kitchen, bike, etc. Size: caliber 86mm Colour:black Material:PP Package Contents: 4 x Jar Lids(Does not contain bottles) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.