I don't know exactly what type of plastic it is. :-( The hobby store where I used to live had a little stock of assorted plastics in diffrent sizes, shapes, and colors. The material I used is a hard but slightly forgiving white plastic. As far as exactly what type of plastic its made out of, I can't be sure. The walls of my tube were aproximately 2 mm thick. The outer diameter is just barely smaller than the inner diameter of the tail boom. The inner diameter is still big enough for the wire drive to pass through it feely