Unlike most of the gym floors we see, which are cut out, these have nice clean edges which would meet up neatly with the next panel. Plus the ends match up with every other two boards being offset. The panels are mounted on a 1/2" thick sheet of OSB. It used to have 1 1/2" high sleepers underneath it, but they've been removed as has any of the interlock system which you'd find on a lot of the panels from this job. In all reality, I'd be tempted to put no sleepers of some type under it just so I didn't have to fight the staples that are protruding from the bottom of the OSB. Price reflects the lack of sleppers, but that could actually be a plus depending on your application. This one has is all green. Dimensions are approximate.