The largest prayer wheel in Old Tibet once held 100,000,000 prayers, traditionally printed with hand-carved wood blocks.  The “modern” Tibet-Tech Tibetan prayer wheels, created by Sakya Monastery of Tibetan Buddhism and Earth Sanctuary (www.earthsanctuary.org), dwarf that, containing 1,349,580.000,000 prayers in the form of Sanskrit mantras.  As prayer wheels are turned clockwise, Tibetan Buddhists believe that they radiate an incalculable amount of peace, kindness, and relief from misery for all beings. 

The mission of the Tibet-Tech prayer wheels is to foster World Peace with each spin.  Mindfully turning a prayer wheel with 1.3 trillion mantras (sacred  prayers) produces the same benefits as having recited 1.3 trillion mantras   At one mantra recitation per second, it would take approximately 42,776 years to recite 1.3 trillion mantras.  But with just one spin, a Tibet-Tech prayer wheel (at 100 revolutions per spin) releases 27,000 mantras for each of the five billion human beings on the planet.  If placed end-to-end, these mantras would stretch from the Earth to the Moon and back 607,500 times!