Pewter is an excellent rust-resistant material with substantial weight. Pewter is soft enough to be easily bent by hand. To add strength to such soft material against easy bending, a hammer is used to beat the pewter to tighten the molecule structure, producing minute undulations as a result. It also changes the way the surface looks and improves the way it feels to touch. This was how the technique to create three-dimensional shapes from pewter was developed. There are generally three types of pewter processing method. Despite being the same as that used in other metal crafts, the basic technique passed down from ancient times takes advantage of the characteristics of pewter.