Hi Alan,I'm so sorry for the late reply, I'm not surer how we missed your comment. I'm sure it's probably too late, however they're Bluestone coping tiles with a 75mm drop face. These are available in many different sizes, however i'd be guessing that these were 1000x400mm.
House plan help
What do you think of this floor plan for a new build?
Help needed for first time renovators
Help! We need floor plan advice for our family home