And the answer is:

Gray tubing that is used to hold the screen wire in screen doors and screens on windows.

Chances are you have some in the garage left over from re screening the patio screen door after the dog ran through it.

It is hollow!

Cut lengths to your pleasing and use instead of that silly short bumper that comes with buzz bombs. Nothing wrong with a 1/2 to 1 inch long piece, the fish will still be hooked.

If anyone does not know what this stuff is I will post a photo.