Our high purity copper and zinc rod set is made of quality copper and zinc metal, with solid cylindrical structures and smooth uniform surfaces. Each rod has a standard size of 4"(102mm) in length and 0.39"(10mm) in diameter, with stable performance and consistent quality in every piece. This piece set is a practical choice for a wide range of uses, including educational science activities, classroom practice, electroplating exercises, DIY handmade projects, metalworking hobbies and other daily material applications. The high purity raw materials ensure good stability and practical performance for your daily and project needs. Providing both materials you need in one convenient set. The solid structure allows for easy cutting, grinding and processing according to your actual requirements. Please note that copper and zinc metals may naturally develop slight oxidation layers over time, which will not affect their normal use and performance.