There are multiple pieces of wood assembled together to make this sliding wall. The track is an industrial grade hardware with ball bearings. None of our wood is stained, it's all Walnut.

I like that look. Who is your source on the track hardware. There are many great companies I have used in the past, but always looking for more ideas.

Thanks for the tip on the Grant hardware! These are much smoother than what I've used. My next project will include these! Hats off to you!

its also bookmatched walnut if my eyes are correct :-)

Is it American Walnut? There are so many varieties of Walnut available here in Australia.

Yes, all the wood is American black walnut.

Does the bottom of the sliding door have rollers or other hardware? If so who makes it?

No, the bottom does not have any rollers or track on the floor, only a recessed guide on one end of the wall.