Amazon.com: 1pcs Carbon Fiber Tube 3K 6MM OD X 5MM ID X 500MM (3K High Gloss Plain)100% Roll Wrapped/Tubing WHABEST : Industrial & Scientific
Amazon.com: ARRIS 6mm x 4mm x 420mm Carbon Fiber Tubes, 6mm 3K Roll Wrapped 100% Pure Round Carbon Hollow Rod for Quadcopter Multicopter Twill Matte (2PCS) : Industrial & Scientific