A Rudraksha rosary is most commonly prepared from five faced beads that are available most abundantly and also in various sizes . In Devi Bhagwat Puran one can read about method of preparation of Rudraksha mala for counting beads while chanting mantras. The main mouth (whole side) part of a Rudraksha is called Brahma, the middle part Rudra (Shiva) and the hind part Vishnu. Thus the Trinity form of Lord Rudra gives the worldly pleasures and salvation to man in this world. Lord Shiva's mantra "Om Namah Shivaya" or any other mantra chanted with Rudraksha mala gives unlimited benefits as told in Shiva Purana.  very beneficial for health purposes,keepsmind and body calm and peaceful.  Rudraksha malas are very powerful for chanting of mantras and hence mantras become more powerful when chanted on these rosaries/malas.All types of mantras can be chanted on these rosaries/malas.