Each BILLETSPIN top is machined from premium materials such as steel, bronze, copper and exotic materials like damascus, super conductor and mokume. Each top design goes through rigorous research and design stages before finally being machined by state-of-the-art CNC machines. With dozens of unique designs, BILLETSPIN tops range from simple 1-piece models to more intricate 3-piece and higher. The tops are forged together and meticulously tested and inspected by hand for optimal performance and balance. All BILLETSPIN tops utilize high-quality ceramic or ruby ball bearings which allow for spin times of up to 20 minutes and higher.