You will get a dozen red rubber canning rings.

These are custom cut to fit on all standard Regular Mouth Vintage Glass Canning flats.

Put your vintage flats to work without search for old stock or cutting off tabs! These are custom fitted to provide a great seal when combined with a glass flat, a regular mouth jar and a tall ring. (These may not work with modern rings which are not tall enough to provide a secure grip on the thickness of glass + ring.)