The text speaks of "Rufai needles". I found an explanation on the web, translated: "In the Rifa'i raatheeb ritual, miracles called "Burhan" occur at some times during the dhikr. Iron dhikr needles are inserted into the bodies of some sect members by the sheikh who manages the dhikr. While the disciples continue to chant while holding these skewers, they aim to show that nothing can harm people unless God allows it and to guide the unbelievers. " I wonder if the objects attached by chains were used for self-flagellation. One large, domed room contains articles that almost all have a dervish background. It is the former classroom of the complex. Türk ve İslam Eserleri Müzesi is usually translated as “Museum of Turkish and Islam Art” though I think “eser” is simply thing, article, not necessarily art.