Ecojarz stainless steel drink lid for canning jars is a revolution in sustainability. This small mouth top allows you to turn any standard-sized canning jar into a sustainable to-go cup! You can even reuse many glass jars from products like salsa and almond butter. These stainless steel lids are entirely non-reactive and can be used with hot or cold beverages without any worry of chemical leach. They are completely BPA and phthalate free. A “jar ring,” the metal ring which threads onto a glass jar, is required to attach an Ecojarz top. It works just like a canning jar lid but is not included with this drinking top.