Carbon Fiber Tube: 4mm x 2.5mm, 1m Long
by RMRC

Great for reinforcing wings and tails, these hollow carbon fiber tubes can be used as additional spars. If you do not want to create an extra channel in your wing, they can also be inserted into your main spar for extra reinforcement. Just make sure they are a snug fit.

*Due to the nature of the manufacturing I.D. can vary slightly