4 Ball Regular Mouth Mason Preserving Jars 945ml 5 "Perfect size for pasta sauces, and tomato based goodies" Miss Hart 06 November 2015 At last we can get these in UK. I imported a pressure canner from USA so I could can fresh produce and these are being filled with spaghetti sauce and soups. It's great as I can buy in bulk, can and use my goodies throughout the year. Would love to see wide mouth versions of these so I can pressure can meats, necks on the regular mouth jars are small for meat products. If you're going to pressure can food please get the Ball Blue Book this is the safe way to pressure can your food. Don't use a pressure cooker to can with these are not the same thing and you could endanger you and your family.