Yes, Hillbilly was right about the type of bamboo. It is often imported here from China (rather close) for the use of gardening stakes and such. I don't use it for arrows as I can get better types locally in the forests, however the one time I did use it, it worked OK.
Don't be afraid to sand the nodes flat guys! Every Asian archery culture has been doing just that for centuries and I'm sure if it was certain to break the arrow they wouldn't do it, ya?
Anyways, once you get the technique down, you will be able to get pipe straight arrows in a few minutes. Such as this:
This arrow is 32 inches long and has 3 nodes in it. As you can see, the nodes do not stick out, and the shaft is really smooth
Alex ....bamboo is better.....