What do compounds that are ductile and excellent conductors of electricity have?

Ductile $\text{materials}$ that are excellent conductors of electricity are $\text{metallic}$.
Metals are $\text{malleable}$, capable of being hammered into a sheet, and $\text{ductile}$, capable of being drawn out into a wire. This workability makes metals the premier materials for making tools. These properties are believed to result from $\text{metallic bonding}$, in which the valence electrons are delocalized across the metallic lattice.