serial number together with some detail of the medical institute. Usually the wristband width need at least 15mm so that the code is clear enough to be scaned. We you scan the code with a phone,coloured wristbands for events the detail of patient name, disease, taboo drugs, status wilcoloured wristbands for eventsl show up. It is a good help for doctor and patient to know the treatment. It will be good help for hospital to manage patients. All the medical bracelets should made from 100% silicone which is harmless and eco friendly to avoid secondary injury to patients. If the medical id bracelet is embeded with a chip, it will note down the information of exercise, heart beat and sleeping. Then trafer it to the phone app. It contribute to health care. Order less than 100pcs, get 50pcs free and 5pcs keychains free. Order 100pcs or more, get 100pcs free and 10pcs keychains free. All the free wristbands and keychains are same design of the one you order. and personal care supplies, sports and outdoor. Supplies, toys, automobiles and industrial products. We can also buy custom rubber bracelet from amazon. Let me show you how to distinguish rubber bracelet. First, the false silicone bracelet is easy to suffer from deformation while the true one has good memory to snap back and relatively small permanent deformation. Second, the real silicone bracelet touches smoothly with special surface treatment and easily stick with dust , hair and other impurities. Third, when it burned with fire, the false silicone bracelet will come up with the black material on the edge while the true one shows white powder. And final, tell a reliable method to clean the bracelets. Get it soak in warm water for 3-5min, rub a few and add the detergent if necessary. Then all done after drying by air.