[hahnmeister]

Thats the stuff nanogurl. I use acrylic so I can bond it to 1/4" acrylic flat plates under the sand.

I use 5/8"OD, 3/8" ID extruded pipe. I also have 3/8", but depending on the length and weight of the pieces, you might want to stick with something thicker.

OR, you can use other materials. There were some neoprene and other style rods at the local plastics distributor that seemed very strong and only 3/8" diameter (steel would be easier to bend). But if you use other materials, mounting might not be as easy. I suppose, you could always drill and tap out some threaded holes for the rods... but you might need a thicker base material.