They just kind of set inside of the top of the mason jar, without forming a real seal. You must wash them after each use. I got them for water on my desk at work, and the bamboo cover grew mold inside of two weeks. The metal lid that I replaced with this lid never grew mold after a year. Not worth the money when you can get a Nalgene bottle for the same price.
ο»Ώ
COTEY 3.5" Set Of 4 Egg Rings With Wooden Handle - Large Round Molds For Frying Eggs And English Muffins - Griddle Cooking Shaper For Perfect Breakfasts
39 Review
Polaris EasyKeep-4D Tableware Set Black
38 Review
3 Qt Instant Pot Accessories Set Compatible With 3 Quart InstaPot, Mini Accessory Pack Includes Sealing Ring Steamer Basket Springform Pan Egg Rack Trivet.
31 Review
Amazon Basics Enameled Cast Iron Covered Dutch Oven, 7.3-Quart, Red
36 Review
100-Pack Of Disposable 18-Inch Piping Bags For Cake, Cupcake, And Cookie Decorating - Perfect For Icing And Frosting!
41 Review
PME Scriber Needle Modelling Tool, For Cake Decorating, 5.7-Inch
38 Review
AmazonBasics Silicone Baking Mat Sheet
48 Review
SMARTAKE Non-Stick Parchment Paper Roll, 13 In X 164 Ft (177 Sq. Ft) For Baking, Cooking, Air Fryer, Steamer, Kitchen, Cookies, Bread, And More - White Baking Pan Liner
41 Review