A hologram bracelet or energy bracelet is a small rubber wristband supposedly fitted with a hologram . Manufacturers have said supposedly that the holograms "optimise the natural flow of energy around the body, and supposedly improve an athlete's strength, balance and flexibility". Only anecdotal evidence supports these claims and tests performed by the Australian Skeptics , the University of Wales Institute, Cardiff , and the RMIT 's School of Health Sciences have been unable to identify any effect on performance.