Prayer wheel

"A prayer wheel is a cylindrical wheel (Tibetan: འཁོར་ལོ།, Wylie: khor lo) on a spindle made from metal, wood, stone, leather or coarse cotton.

Traditionally, a mantra is written in Tibetan language, on the outside of the wheel. The mantra Om mani padme hum is most commonly used, but other mantras may be used as well.

Also sometimes depicted are Dakinis, Protectors and very often the eight auspicious symbols Ashtamangala. At the core of the cylinder is a "life tree" often made of wood or metal with certain mantras written on or wrapped around it. Many thousands (or in the case of larger prayer wheels, millions) of mantras are then wrapped around this life tree." - (en.wikipedia.org 29.10.2021)