Pickle Pebbles PLUS+ will fit perfectly in any wide-mouth Mason jar and are twice as heavy as regular Pickle Pebbles. Pickle Pebbles have been specifically designed for use with fermentation and take the guess work out of your lacto ferments by ensuring your veggies stay below the surface of the brine thereby eliminating exposure to oxygen (which is the main cause of failure when using lacto fermenting methods). Pickle Pebbles can be used in all types of fermenting vessels including mason jars (both regular and wide mouth), the Fido style jar, as well as traditional ceramic crocks. While a single Pickle Pebble is often enough to keep veggies below the brine, they can also be stacked to provide extra weight. Pickle Pebbles are made of non-iridized soda glass which is completely inert and guarantees that no other substances leach into your ferment. | Masontops Pickle Pebble Ferment Weight | Size Wide-Mouth