Thematic Packets all with 50 stamps in each. Many (if not all) will be pre cancelled and are at least 25 years old. Packets are not guaranteed to contain stamps shown in pictures as also there may not be a variation between packs of the same subject. i.e. If you buy more than one of the same subject they are likely to contain the same stamps. 

NB - If no quantity is shown, then that item has sold out.