I bought this product thinking the "thick blocks" were in fact a solid block of grungeboard but they're not. The "thick" blocks are 2 small blocks of grungeboard glued together. They came apart in the container before arrival (not from Scrapbook.com). If you want thick solid blocks, apparently they're not in production so you can glue your own thinner blocks together without purchasing this item to get thick blocks. I was disappointed also that some of the blocks had black marks on them apparently from the equipment used to make them.