A communication network includes a Virtual Private Network interconnection to a Foreign Exchange service. The upper having an eyelet which carries a strap. Further disclosed is a method for manufacturing metal sulfide nanocrystals with a core-shell structure by reacting a metal precursor and a thiol compound in a solvent to grow a metal sulfide layer on the surface of a core. The conductive structure which includes a metal-containing conductive material, typically Cu, has a bamboo microstructure and an average grain size of larger than 0.