Concrete form tube thingy...

Whats the name of the round tube cardboard concrete forums? The hardware store close to here stopped selling them and I was going to call around to some places close to here but for some reason I cant think of what they are called.

Come on, I know someone knows the real name for these, people use them for bass tubes pretty often.

Ive always called them Cement Post Forms. I dont know the 'real' name for htem. Just call around and describe them. Or, go to a place like Lowes.com or Homedepot.com andsearch around.
What are you planing on doing with them? IMO bass tubes distort too much. It seems that a round object would hold pressure better but if you put your hand on a n enclosure made of These cement formers while any decent woofer is pounding then put you hand a 3/4" MDF or Marien Plywood enclosure that has been properly braced the square enclosure doesnt vibrate near as much. plus a square design is more economical. well thats just my opinion, so.

Its not for a bass tube, its for the exterior of a box I'm building. Its too hard to describe, but I'll put up some pictures when I get it build and stuff.