[Leak-proof]There's a silicone gasket on the lid for sealing, which is detachable and easy for cleaning. With the best spout for pouring on these jar pour spout lids, it would be great for using pour salad dressing and close the airtight cap and store them in the fridge. [4 Pack Canning Lids]It's a good way to change your jars into drinking bottles,it's perfect for tea cold brew and protein shakes. You should make some coolness to this hot summer. There are 4 jar lids with handle, just put in a straw and they become lids for drinking. [Widely Used]The inner diameter of each jar pour spout lid is 85mm,which is perfect to compatible for all wide mouth jars. with airtight jars flip top lids, which is a long-lasting storage solution for any wet or dry foods. [High-Quality Materials]These flip cap lids are dishwasher safe, fridge and freezer safe to use.