The back of the stamp mount has residue from tape glue from when it was stored elsewhere. The stamp itself is fine, but please refrain from purchasing if you are concerned about this. Please refer to the green mat below for size, with each grid line representing 1cm. We offer a discount for the combined shipping cost if you purchase multiple items together. Please let us know by commenting or sending a bundle request if you wish to do so. If you are sending a bundle request, please submit it with the current price. We will calculate the shipping cost later and make the necessary adjustments.