Use this stainless-steel lid to convert canning jars into mugs for sipping homemade drinks on the go-from iced tea, lemonade or kombucha to fresh fruit smoothies. A wrap-around silicone gasket fits underneath the lids to ensure a tight, leakproof seal. Suitable for use with any standard small-mouth canning jar. Nonreactive stainless steel won't absorb flavors or odors. Each lid has a hole for a straw (sold separately) . 2 1/2" diam. A Williams-Sonoma exclusive.