Each pure copper and zinc rod comes in suitable size of . Length x Diameter 100mm x 10mm(3.94 inch x 0.39 inch); the convenient size is available for many applications, granting you the flexibility to use these metal bars for different projects. Due to the excellent conductivity and wear resistance of copper, pure copper rods are widely used in wires, cables, conductors, electronic components, as well as in the manufacture of various mechanical parts, bearings, gears, etc. Pure zinc rods are often used as protective layers on metal surfaces, extending the service life of other metals such as iron and steel through electroplating. The purity copper rod is made of 99.9% pure copper, which has metallic luster and good electrical and thermal conductivity; The purity zinc rod is made of 99.9% pure zinc, which is suitable for electroplating and different fields. They are hard, strong, rust proof, - and long lasting. Package includes 5 copper rods and 5 zinc rods, sufficient round rods to satisfy your DIY crafting and metal working projects, let you fun greatly to process your metal tools. To prevent bare copper zinc rods from gradually oxidizing under prolonged exposure to air, it is recommended to wrap them with fiber membrane and store them in a dry place when not in use. This storage method help extend their lifespan and maintain their excellent performance.