The WECK canning rings with a diameter of 80 mm are perfectly suited for airtight sealing of WECK round-rim canning jars. Made from food-safe natural rubber, they ensure hygienic use and are intended for single use. For optimal function, boil the rings in water with a little vinegar for about 5 minutes before canning. This way, canning is reliably, safely, and easily achieved for the best preservation of your supplies.