Resistance is the function of conductivity of the material, cross section area of the conductor, and length. In the case of wires the length is long, so they n

Resistance is the function of conductivity of the material, cross section area of the conductor, and length. In the case of wires the length is long, so they need more cross sectional area to keep the resistance down, in the contacts the length is very short, so they need less cross sectional area to achieve the same Resistance. Often, they make the contacts from an even more conductive material than copper like gold or silver, so that helps even more.