The cord is the same for the entire suitcase and must be made of nine threads, symbolizing the Vajradhara Buddha and the eight Bodhisattvas.
The larger cord at the end represents wisdom, perceiving total emptiness, and the cylindrical cord at the top of the large bead symbolizes the void itself. Together, they symbolize triumph over all opponents.
108 is the ideal number for all kinds of purpose. It is important that our thoughts be pure when reciting or singing the mantra.