You've probably seen the brass neck rings worn by the women of certain tribes in Thailand that elongate their necks. I've always thought or been told that the rings elongate and stretch the neck, support the neck whose muscles have atrophied and that these women could not support their heads if the rings were removed, even that the head would flop over and they would suffocate. Well, not really. (another "truth" dispelled, regular readers here know I'm all about exposing those.)
A neck ring is a band of metal worn as an ornament around the neck. The Kayan tribe or Padaung tribe from the border region of Myanmar and Thailand begin to wear neck rings when they are children. Gradually with age the number of "brass coils" worn increases to elongate the neck. Actually they are not rings but continuous coils that are shaped out of one or more brass tubings.
The custom of wearing neck rings is related to an ideal of beauty: an elongated neck. Neck rings actually push the collarbone and ribs down. The neck stretching is mostly illusory; the weight and force of the rings cause the rib cage and shoulders to grow at an angle 45 degrees lower than what is natural, causing an illusion of an elongated neck.
When the coils are removed, there is no health danger or proven medical concern. In fact the women usually have their neck rings removed during childbirth or general maintenance of the rings. Sometimes women don't see their necks for 5 or 10 or 20 years. When they do remove the rings, it is even a source of fascination among the women themselves.