Got these for my o gauge layout. Using them for retaining walls at tunnel openings. These are great if you have limited room & if you don't have the space for plaster rock molds. Down side is the actual size of the stones. Packaging says Large random stones for O/HO. Largest is only 1/2 wide and roughly 3/8 high. However, the detail is good, it's flexible, you can cut to size & has a peel and stick back. I bought 4 & ordered 2 more.