Nicholas Daak said: 2" pvc. I had only seen it once, but it looked really nice. I am sure it is really cheap to do a course, but maintanance might be consuming. That and I am not sure how stable they would be since they are so light.
Keith Fellenstein said: Or do away with ballwashers...don't need 'em. Ever see anyone putt out with dirty ball? Why would you need to wash it on the next tee?