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.
According to the Tibetan Buddhist tradition based on the lineage texts regarding prayer wheels, spinning such a wheel will have much the same meritorious effect as orally reciting the prayers.
With the 50 /1.4 and the huge variety of such wheels in Sikkim, India – I took many, many, many such pics.
Lingdum Monastery, Gangtok, Sikkim, India
Nikkor 50mm f/1.4 MF AIS
f/2.8 @ 1/750 secs