The product is a Mercedes-Benz hydraulic cylinder line for convertible tops, specifically designed for models between 11-17 including the E350, E550, and E400. It is a black bolt-on attachment type with easy installation features, made in Germany. This line is not a vintage part and is not universally fitting, but is specifically designed for the rear placement on the vehicle. It is not a performance part, but a genuine accessory designed for Mercedes-Benz convertible tops.