Carbon Fiber Square Tube - TipTop Composites Pultruded carbon fiber tube is used for racing drones, RC helicopter wing, RC airplanes and RC sailboats, kite spars. 5mm x 5mm side length in cross cection(Square), 4mm inner round diameter, 200mm overall length., Pultrusion. 5mm x 5mm side length in cross cection(Square), 4mm inner round diameter, 200mm overall length., Pultrusion. Uxcell 2Pcs Carbon Fiber Tube 2 X 4 X 420mm Pultruded Carbon Fiber Tubes 14x16x420mm Glossy Surface Rod 3k Roll Wrapped Round Tubing For Rc Airplane 401d50d9 D5c0 4ef9 Bae9 4046074b34e4.189fb30f84703b188559e9746ac9c35c Lightweight. Strong as metal but only one fifth in weight. Corrosion-resistant and heat-resisting. Smooth surface. Made from high tensile and modulus unidirectional carbon fiber, with polishing finish. Application. Pultruded carbon fiber tube is used for racing drones, RC helicopter wing, RC airplanes and RC sailboats, kite spars Pultruded tube means that all the fibers are in one direction, which makes it stronger than the woven tube in tension., Lightweight. Carbon Fiber Square Tube with Rounded Inner ShapeSize. Carbon Fiber Square Profile Pipe - Carbon Fiber Square Tube and Square Strong as metal but only one fifth in weight., Corrosion-resistant and heat-resisting., Smooth surface.