Smooth Surface: made of high tensile carbon fiber, matte surface. 11x3.7 inch FLUXER PRO MATT carbon fiber propeller Description:Size and Shape: rounded tube with 10mm outside diameter, 8mm inner diameter, 330mm overall length. Note: due to manual measurement, most carbon fiber tube sizes will have a little error. Size and Shape: rounded tube with 10mm outside diameter, 8mm inner diameter, 330mm overall length. Lightweight: strong as metal but only one fifth in weight, corrosion-resistant and heat-resisting Features:Tube Shape: Circular PipeOutside Diameter: 10mmInner Diameter: 8mmOverall Length: 330mm Package Content:1 x Carbon Fiber Tube Lightweight Carbon Fiber Wing Spar 330mm Length 2Pcs Carbon Fiber Tubes 10 X 12 X 330mm Matte Surface Rod 3K Roll Wrapped Carbon Round Tubing For Rc Airplane Cc15de25 0bad 424a B6ed 3992040f10f5.1dc7f3e182cc09e6dae2cc6ae71a5e6e High Tensile Carbon Tube For Quadcopter And Sailboat Application: carbon fiber wing tube is used for racing drones, RC helicopter wing, RC airplanes and RC sailboats, kite spars. Smooth Surface : made of high tensile carbon fiber, matte surface.