Polyester or polypropylene bags for packaging stamp collections. Polyester and polypropylene are very stable materials, chemically and physically, and do not interfere with the species they protect.
 They do not yellow, nor do they change over the years.
 The polyester is very transparent and allows you to see the seal without having to remove it from the bag in which it is inserted.
 Dim. int: 5x5cm.
 Pct 25.