Brass base, mouth blown Murano crystal glass. Bulb Brass is a member of the Ingo Maurer Bulb family. Based on the world-famous 1966 design, the Ingo Maurer team developed a brass version. The handcrafted lamp base is made of high quality brass. The untreated brass surface tends to change over time, giving it a special character. A patina is created, a surface created by natural aging. Patina is the result of daily use and is perceived as an aesthetic gain, as it stands for a characteristic material property that can ultimately be understood as the individual signature of the user.