Made of ABS and aluminum. Suitable for wood-paneled interiors, retro, American, and classic cars. Approximately 5cm in diameter. Weight: 170g. Compatible with almost all car models. The included adapters are 8x1.25, 10x1.25, and 10x1.5, for a total of three. Without an adapter, the knob itself is 12x1.25. *For the Copen, the included 8mm adapter can be used for AT models, and the 12mm adapter for MT models (see image).