http://www.dailymail.co.uk/femail/article-1343941/Power-Balance-bracelets-better-rubber-band-Maker-forced-refunds.html
Power Bracelets - celebrity trend items that supposedly improve performance are exposed as a mere psychological placebo. See the above link.
It is unlikely most people would have been deluded by these? Even so sales worldwide are claimed to be millions.
Religious trinkets such as Cabal bracelets, crucifix, medallions, rosary beads, worry beads, lucky charms, amulets and assorted paraphernalia, relics and objects enjoy the same type of status in the mind of believers. Claims of spooky power having no actual substance. Just psychological tools.
Funky but futile Power Bracelets may also be worn purely for fashion purposes and form part of the pantheon of mass market plastic jewellery circa early 21st century.
