I had seen prayer wheels like these before, but I didn’t know much about them. I found the idea of these prayer wheels very generous and it was a very peaceful place.
They are made of copper with the mantra, “Om Ah Hung Vajra Guru Padma Siddhi Hung” pressed clearly into the copper. Inside each prayer wheel, there are 100,000 Tibetan script reiterations of the same Padmasambhava mantra.
When turned the wheel spins quickly, and it is thought that this action invokes the intended deity mantra, sends blessings in all directions, and expands the merit field of the practitioner. If there are multiple wheels turning at once the merit field is increasing in manifold dimensions and this is why having Prayer Wheels at the monastery is of profound importance.