Alexandre Gervais

A prayer wheel is a cylindrical ’wheel’ (Tibetan: ’khor) on a spindle made from metal, wood, stone, leather, or even coarse cotton. Traditionally, the mantra Om Mani Padme Hum is written in Sanskrit externally on the wheel. Also sometimes depicted are Dakinis, Protectors and very often the 8 auspicious symbols Ashtamangala. According to the Tibetan Buddhist tradition, spinning such a wheel will have much the same meritorious effect as orally reciting the prayers.Wikipedia