1.This product is a carbon fibre tube. The carbon fibre tubes can be easily cut to the desired length with a cutting machine or fine tooth saw blades. They are suitable for various applications such as racing drones, RC helicopters, airplanes, fishing, sailing boats, DIY crafts and dragon walking. They can be used to build drone frames, reinforce RC helicopter wings, build lightweight RC planes and create durable kite masts. 2.The size of the carbon fiber tube is: Diameter: 10 x 12 mm (IDOD); Length: 420 mm; Finish: glossy finish; Package includes: 2 pieces carbon fibre round tube. 3.The pure hollow carbon fibre tube is made of highquality carbon fibre composite material. It is high strength, corrosion resistant, has a smooth surface, good straightness and stable performance. Its specific strength and modulus of elasticity are actually higher than carbon steel, but it is lighter than aluminum. It has good tensile strength and ensures longlasting performance even in demanding environments. 4.The use of the carbon fibre tube is as follows: 1. Choose the right tool for cutting the carbon fibre pipe; 2. Align the opening of the carbon fibre pipe with the installation components, plug it in and fix it.