Transform your jars into your new favorite on-the-go drinkware. Made from sturdy and long-lasting stainless steel, specially designed to bring even more uses to your regular mouth mason jars. The metal lid snaps open and closed, providing you with a drip-free seal when properly secured. Easily add flavor to water to help you increase your H2O intake! Great for fitness and healthy gurus, yoga lovers, and summertime days. We recommend using a 16 oz. jar for best use. To use, apply force until lid snaps in.