【TUBE SIZE】Outside diameter×Inner diameter: 2mm×1mm, 2.5mm×1.5mm, 3mm×1.5mm, 3mm×2mm, 4mm×2mm, 4mm×2.5mm, 4mm×3mm, 5mm×2.5mm, 5mm×3.1mm, 5mm×4mm, 6mm×3mm, 6mm×4.1mm, 6mm×4.5mm, 6mm×5mm, 7mm×5mm, 7mm×6mm, 8mm×4mm, 8mm×5mm, 8mm×6.1mm, 8mm×6.5mm, 8mm×7mm, 10mm×6.1mm, 10mm×8.1mm, 10mm×8.5mm, 9mm×6mm; Length: 500mm. Transition: 1cm=10mm=0.39inch. 【CARBON FIBER】Processed from carbon fiber. 【PRODUCT PERFORMANCE】light weight, high strength, corrosion resistance, good stability, flame retardant, beautiful, easy to maintain, not easy to age, etc. The outer and inner walls are smooth. 【CARBON FIBER TUBE APPLICATION】kites, mechanical equipment, remote control models, extension tubes, drone heightening tripods, DIY aviation models, multi-rotor support rods, PC equipment shafts, etc. Flexibility:The Carbon Fiber square tube combines rigidity with flexibility, allowing it to absorb shocks and vibrations, making it suitable for dynamic applications。, Manufacturer: HLHLH