<<
Well Bamboo is not hollow but can be cleaned out on the inside but it is also tapered. How big on the outside?? I also would be thinking PVC if it has to look like wood get some of that really thin wood they sell for inlay"s and wrap it.
Bleep >>
Problem is, I need to use a woodburner on it, so the inlay would have to be thick enough for that. I will check into it and see what is available, we just had Home Depot open a store up here.
Lengths need to be approximately six and eight inches in length, for those using the English measurement system.

Thickness of the walls of the tube would be approximately a quarter of an inch, and structural strength is not a major requirement.
I must say, I am amazed at the curiousity my little craft project has aroused. :Q