Plastic
Mason jar caps: the practical mason bottle lids can help to seal the mason jars and prevent leaking, convenient to use,wide mouth bottle covers
Sealed bottle covers: manufactured with and sturdy plastic material, the mason jar lids are and for a long time using,bottle lids
Canning lids: a good sealing effect can be achieved by using these thread plastic mason jar lids,mason jar
Reusable covers: this set contains enough quantity of mason jar lids that can meet your different needs and can be used for a long time,freezer jars
Mason jar covers: excellent workmanship and good sealing function, and this lid is very practical and convenient,wide mouth canning lids