The wheels are set on a spindle to twist and have Tibetan Buddhist prayers, mantras, written around the outside.
This lady was incredibly cute. I followed her a bit... as she walked around the large stupa and pushed each prayer wheel as she kept a steady pace.
prayer flags... and ...prayer wheels
One of my favorite purchases while in Kathmandu was a prayer wheel! I bought a small one to sit on a shelf or hang on the wall... my prayer wheel is red, teal, blue, and gold.