Hi Upperfalls,

Thank you for your interest. The size of the squares are 30" x 30" x 2" thick. The material we used is actually stone and not concrete. You could, however, pour concrete squares of the same dimension and install them using the same dry laid method. If you use concrete as your material I would make sure you use a strong concrete that is at least 2" thick.

The stone is a Pennsylvania quartzite and is quarried out of eastern Pennsylvania.

Thanks again,

Bill