Fruit Preserving Skins (North Abingdon, OX14)

Lots of fruit preserving skins.
There are at least 20 round ones, which are like thin paper.
There are 5 square plastic ones and 1 large plastic sheet which can be cut down. These come with instructions (I think you heat them to create a seal) and string ties. A couple look like they have been used but most haven't.

They are all quite old.