Glass is preferred to plastic by 76% of consumers. Part of the Ball drinkware series. Regular mouth (70mm). 4 pack. Ball 16oz drinking jars are made with the same high quality glass as Ball canning jars with the addition of a handle to make holding the jar easier. These jars are not. recommended for home canning. Can be used with regular mouth Ball Sip & Straw lids. Ball plastic storage caps or any regular mouth 2-pc caps for drink storage.