ARRIS 14mm Outer Dia. 500mm 3K Roll Wrapped 100% Carbon Fiber Tube 12mm x 14mm x 500mm Matt Surface (2 PCS) 3K Pure Carbon Fiber, use for RC Quadcopter, Multicopter, Helicopter and Airplanes. Length: 500mm Outer Diameter: 14mm Inner Diameter: 12mm Package Includes: 2 pcs x 12mm*14mm*500mm carbon fiber tube (Matt Surface)