Transform your jars into your new favorite way to grab a cuppa. This canning jar is made from sturdy and long-lasting stainless steel, specially designed to bring even more uses to your regular and wide-mouth mason jars (jar not included). The metal lid snaps on to both sides of the jar, providing you with a leak-free seal when properly secured. Easily add coffee grinds to the funnel and pour in boiling water. Great for on-the-go coffee aficionados. To use, apply force until lid snaps in. If you are having difficulty assembling, please run the band over hot water for 30-60 seconds and then try to snap in. Cover, sip, go. It's as easy as that.