Kangaroo bits are made from a high percentage of copper (70%) but have a small amount of Nickel in order to give the bits a stainless steel appearance.The Kangaroo Waterford is a smooth multi linked bit which is designed to lie in a curve. This is why the bit is made slightly oversized. There is a smooth 1" shoulder before the links start which eliminates pinching to the links. All the Kangaroo range will have a small picture of a Kangaroo somewhere on the bit!