It can effectively reduce the door closing buffer and door damage. Made of aluminum, strong and durable, anti-rust. Style: top-mounted type A, top-mounted type B: load-bearing 25-65kg; side-mounted type load-bearing 30-60kg The automatic door closer solves the bad habit of forgetting to close the door when going out. Thank you for your choice. If you have any questions, please leave a message and we will get back to you promptly. Happy shopping.