Ice hockey puck.In place of the rubber pads, I use pieces of MDF (do they have that in the UK and OZ?). MDF is "medium density fiber board". Though people in that industry will cringe when I say it, MDF is basically very thick, high-density cardboard. It is a remarkably handy material for all sorts of uses around the shop... as long as you don't get it wet.
Do you play ice hockey in the States?
I don't think they do.
A bit like Sweden they play Hockey.