Features: Diameter:10mm/0.39inch Length:100mm/3.94inch our copper rod are crafted from of 99.9% copper, The remarkable attribute of these copper rod not only ensures durability and sturdiness but also include resistance against corrosion, temperature, and pressure. To maintain their effectiveness, it's recommended wrapping them in a fiber membranes and storing them in a dry place; This method prevents oxidation and ensures that our metal rod properties are maintained until ready for use. Application:Widely used in Gear shafts, motor shafts, short support shafts, shafts pocket model, miniature axles, model plane, model ship, model car. Specifications: Component:Copper Diameter:10mm/0.39inch Length:100mm/3.94inch Package Includes: 6Pcs Copper Round Rod note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.