Hinge materials is usually made of Cold Rolled Steel and Stainless Steel. The surface will be nickel plated.There are usually three types of hinges: Full Overlay, Half Overly, Inset. These three different types of hinges are mainly used for cabinet doors of different combinations. There is another classification, normal hinge and soft closing hinge. The soft closing hinge has a buffering effect. This way, when the cabinet door closes, it can avoid making too much noise.Normal hinge has two kinds, one is one way hinge,the other is two way hinge.It's easy to distinguish between the two, two way hinge can stop when it's closed to 45 degrees.And The two kinds of soft closing hinge are slide on hinge and clip on hinge.