My son had the BIOFLOW Sport bracelet and it split and burnt his wrist and made his veins swell up, we were assured when it was bought that they were sealed and safe but obviously not, I have been in touch with BIOFLOW, but they are now saying they are only guaranteed for 6 months, my son has a permanent scar from the initial entry where it burnt his skin. I have the Piroutte bracelet and an anklet, but I have taken them off now in case they end up burning my skin, not happy with the response I got from my complaint, I have always recommended BIOFLOW bracelets to people but not anymore, I think if something is sealed and sold as being safe then it should be guaranteed to stay that way. Not a happy customer anymore.