They're 5 1/2" square not 6" but it didn't affect the installation. They were easy to install but that's because I turned it over to my more patient than I husband. He did a great job. I did choose placement to insure no two of the same pattern were too near one another. That gets tricky as more are in place. We put them on the back of the kitchen penisula facing the family room.
It does look good but it's a little too busy for me. I should have known better since I avoid clutter like the plague, I keep thinking I'll get used to it. I have just noticed there is some bubbling and coming away at the top. These are installed on a smooth, clean surface so it appears the adhesive isn't very strong. Still, I think these tiles are a good, easy way to change things up a bit.