Lightweight: strong as metal but only one fifth in weight, corrosion-resistant and heat-resisting. Carbon Fiber Pultrusion Plate Flat Strips Pultrusion Carbon Fiber Pultruded Strips - Carbon... Description:Size and Shape: pultrusion rounded tube with 4mm outside diameter, 2mm inner diameter, 420mm overall length. Carbon Fiber Pultrusion Plate Flat Strips Pultrusion Carbon Fiber Pultruded Strips - Carbon Drone Frame Tubing Uxcell Carbon Fiber Rod, 6mm X 420mm For RC Car Plane DIY Tool Wing Tube Quadcopter Arm, Pack Of Model Airplane Spar Material Size and Shape: pultrusion rounded tube with 4mm outside diameter, 2mm inner diameter, 420mm overall length. Uxcell Carbon Fiber Round Tube 4mm x 2mm x 420mm for RC Airplane Quadcopter 4 Pack | Walmart Canada Features:Tube Shape: Circular PipeOutside Diameter: 4mmInner Diameter: 2mmOverall Length: 420mmPackage Content:8 x Carbon Fiber Tube Application: pultruded carbon fiber tube is used for racing drones, RC helicopter wing, RC airplanes and RC sailboats, kite spars.