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
Nonstick Frying Pan Skillet With Swiss Granite Coating And Lid, Healthy Cookware Chef'S Pan With Glass Cover, PFOA Free (11 Inches)
42 Review
Polaris EasyKeep-4D Tableware Set Black
38 Review
Amazon Basics Enameled Cast Iron Covered Dutch Oven, 7.3-Quart, Red
36 Review
Stationary blender RAWMID RVB-02 blue, blue
31 Review
GOBAM Wood Rolling Pin: The Perfect Dough Roller For Baking Cookies, Pie, Pizza & More - 13 X 1.38 Inches
35 Review
PME Scriber Needle Modelling Tool, For Cake Decorating, 5.7-Inch
38 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
2-Pack European Grade Silicone Bunte Cake Pan Set - Non Stick Bakeware Fluted Tube Mold For Jello, Gelatin & Cakes | 9 Inch Baking Pans | Aokinle | BPA Free
38 Review