Aluminum alloy mechanical disc brakes for mountain bikes, road bikes, and folding bikes. The brakes are available in two options: F160/R140 for the front wheel and F180/R160 for the rear wheel. They are made of durable aluminum alloy, have a weight of approximately 240g for one piece and 480g for a set, and come in black color. The brakes are designed to be integrated, anti-corrosion, wear-resistant, and durable. They are suitable for 160mm and 140mm disc rotors for the front and rear brake positions, respectively.