our Coppers rod are crafted from of 99.9% Coppers, high purity without burrs; The attribute of these Coppers rod not only ensures durability and sturdiness but also include resistance against, temperature, and pressure Application: Widely used in Gear shafts, motor shafts, short shafts, shafts pocket model, miniature axles, model plane, model ship, model car Length: 100mm / 3.94inch Diameter: 10mm / 0.39inch To maintain their effectiveness, it ' s recommended wrapping in a fiber membranes and storing in a dry place; This methods prevents oxidation and ensures that our metal rod properties are maintained until ready for use, Manufacturer: Hrtyvhin