Artistic Stairs Inc. Not knowing for sure, but I am thinking the stair structure must be steel to get that look and stregth. The treads have been cladded with hardwood flooring it looks like.
The tread depth or run looks to be about 12" and the rise looks like it is about 7.5". Hope that helps!
Here is another example where the treads are covered with another material. No wonder; wood is much warmer to the touch than steel. A look from underneath ...
example of glass guardrail and a 180 to go downstairs. Just missing the 2 steps down. Top mounted onto tile but kind of looks like what carpet would. Top rail too heavy for my liking.