A CD case is typically 14mm thick, 120mm wide, and 124mm long. The thickness can vary slightly depending on the case manufacturer. Some cases may be a little thicker or thinner, but the dimensions are generally standardized. Most CD cases have a capacity of two discs. Some cases may have more or less capacity, but two discs is the most common. CD cases are made from a variety of materials, including plastic, cardboard, and metal. Plastic is the most common material used for mass-produced cases. Cardboard is often used for packaging CDs that are sold as part of a set, such as a box set of music CDs. Metal cases are sometimes used for high-end audio CDs or limited edition releases.