Ms physics brick

Hello everyone, is there any suggestions on this issue? The two interlocking bricks start floating when I run the MS Physics simulation. What are the proper settings for them to behave like an actual brick?

There may be a grouping problem.
If you share .skp file, we can respond better.

Thanks #ecati I copy a dropbox link with the file!

Yeah, as I predicted, there’s a grouping problem.
If you do the grouping as I do in the file, the problem is removed.
brick_ecati.skp (96.2 KB)