These wide mouth are tightly sealed with leak-proof seal and turn into a drinking bottle,to storage some dry or beverage,cold brew coffee,iced tea,lemonade,milk,salad with removable silicone gasket a seal to leak proof,easy to use,simply screw the lid on and then press flip cap hard for leak-proof.The airtight seal keeps your food The wide mouth flip cap are tightly screwed on jars,will never off while you are pouring,suitable for ball jars and other wide mouth jars, not fit regular mouth jars High quality food- plastic and silicone material, free,leak proof,flip cap fashion design,dishwasher safe, pouring lid with a hole for easy to carry and hanging on kitchen,bike,backpack,. Canning use with wide mouth jars to take some food 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 , dependable seal to keep your foods and that it will never leak. Flip Cap Design with a Ring flip cap is sturdily attached and will never off. The ring on the top are made for easy take out or hanging on kitchen, bike, etc. Size: 86mm Colour:black Material:PP Package Contents: 4 x (Does not contain bottles) Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.