Kilner screw-top preserve jars feature two-part lids; while one part forms the seal, the other screws down, holding it firmly in place. These seals make up the former, and feature a tight rubber seal. These seals are suitable for re-use*Spare seal goes under the outer lid
*Rubber lining forms an airtight seal
*Can be reused up to 10 times
*Box quantity 12