In 2005 I put down a 16 by 38 patio using Nicolock holland stone pavers. They are about 4 by 8 by 2 3/4 in size. Hard work but real fun. I like the way they look. They say they can be good to 5,000 psi when cured. (I guess that is the manner the concrete strenght is rated over 3000 is supposed...