The tiles within the medallion are the same as the field tiles - they're just set differently.

Thank you but what is the size of the tile?

Yes what is tile size?

I wish someone would answer I'd like to do this to my backsplash and need to know the tile size.

That tile looks like 3x6

3 x 6

Which ever you like. The chair rail is thicker and more formal looking, generally. The liner is thinner and more stream lined and contemporary or casual in feel. There aren't any "rules".

3x6.