Carbon fiber rods are used for quadcopters, helicopters, RC planes, scale models, handrails, indoor kite building, graphite fishing rods, wing and tail reinforcement, 3D printers, arrow rods, DIY subject support poles, nets, tents, bows, hatches, PCB device shafts, luggage, hand poles, and RC plane reinforcement. Material: Carbon fiber; Diameter: 5mm (0.2 inches); Length: 420mm (16.5 inches); Pack of 10 x Carbon Fiber Round Rods; Ideal for builds requiring great strength without excessive weight; High strength, corrosion resistance, smooth surface, straightness, and stable performance; Specific strength and elastic modulus are actually higher than carbon steel and lighter than aluminum; Good electrical conductivity and very good tensile strength; Carbon fiber rods perform well, especially in bending and compression applications. Can be cut to any length. Please allow 1-5mm error due to manual measurement.