Mamó Mason Jars based in Dublin Ireland are selling Ball Preserving Jars in Ireland for delivery or collection. Mason Jars are a preserving jar made in the US. Traditionally they were used for storing home made food like jam. They come in a variety of sizes and some limited colours. Each jar comes with a 2 part lid, the outer ring with the threads clamps down on a sealed disc. Besides just looking great, a subculture has emerged where the Mason Jars are used as the basis for DIY projects, you can see a few of the hundreds of examples below.