CNC machined brass body made in USA.
Yes, it comes with the brass roller.
The cleaner is a weighted absorbent roller
that may be saturated with any of a wide variety of
(or may be used without fluids). The roller is guided along the rails by the
frame of the cleaning car. The roller is allowed to "float" and gravity will
press it firmly onto the rails. Because there is a small amount of drag
concentrated in the roller, it will be slipping (slightly) even when
turning. Rail grime is absorbed into the cleaning surface of the roller and
removed from the rails (not just smeared around).
The fluid that remains on the rails (before