You are looking at 25 two inch X three inch separate blocks. There is one that is 1″ x 1 1/2″. I believe most of the marks/stains will come out with a proper cleaning. I have not dusted or cleaned these. You will receive all 26 blocks. There is nothing on the reverse side. My lighting wasn’t kind to some of the block photos. All the photos are without fading. The pictures should show details and condition.