The shackle of most padlocks is made from hardened steel, although more expensive padlocks may have boron alloy steels to make them more difficult to cut. Inexpensive padlocks usually have a shackle made of ordinary steel. Corrosion-resistant padlocks usually have a brass or stainless steel shackle although these materials have low hardness and are easily cut with bolt-cutters. The material that the shackle is made of is usually stamped in the center of the shackle. For example, a hardened steel shackle will be stamped "HARDENED" or a boron alloy shackle will be stamped "BORON ALLOY". Alloy steels with appropriate heat treating provide much higher cutting resistance to bolt-cutters. Alloy steel shackles are plated with another metal such as nickel or chrome to protect them from rust. The body of the padlock is usually also plated. Brass and stainless steel padlocks do not need plating, although they are sometimes plated anyway for appearance.