The project we are working on features a lot of nosing material. These can be provided by the manufacturer, however we've been making our own for a more custom and flexible installation. In this project the appearance of the nosing is a big factor in how the finished product will turn out. Of course this comes with a significant installation bill, but for this type of work you need to pay for a really good installer otherwise you risk not only bad workmanship, but wasting costly material as well.
While it isn't clear in a photo, the nosing are also grain matched, so the grain of the wood wraps around the edge. This makes the transition from vertical to horizontal even nicer.