Thanks Christo and Tara.

I don't know what the floor is made of.  I'll have to go back some time and concentrate on the reflections.  I had never shot pictures of a roller derby before when I shot these and I was just hoping they would come out at all.   There were several images that I thought would have been a lot better if I had pointed the camera down a bit to get more of the floor.  It was great that they had a lot of colored lights hanging from the ceiling that did nice things to the reflective surface of the floor.