This suction cup is made of electric polished aluminum alloy and durable natural rubber, its life span can be 2 years. It can be used on lifting anything with smooh flat surface, such as flat glass (small curved glass aslo applicable), granite, ceramic tile, metal. The suction cup is light weighted, only 585g, it can be easily used and save labor. As a dent repair Tool, this vacuum suction cup allows you to remove dings and small dents in certain areas of your vehicle. Please make sure that the dent is in the flat surface and should be larger than the diameter of the suction cup bottom. It is important to make sure that the objects' surface are smooth, flat, dry and clean, thus the suction force can be created.