A uv silicone wristband can transfer its color darker under sunshine when absorbing uv light. It is not only with good looking appearance but also indicating the strength of the uv index. So some uv silicone bracelets made as the indication with the ruler of levels of index. Wearing on the wrist to avoid long time staying under strong uv. So what makes it uv transfer ? The answer is the UV phosphor which usd uv energy to open the sensitive molecular bond and make it jump from low energy to high energy level There will be a change from visible light to visible light, resulting in the changing color from light to dark. It become a uv silicone bracelet when the UV phosphor is put into the silicone mass and produce it a band. where-to-buy-colored-wristbandsbuy-wristbands-online personalized anniversary braceletswidth="350" height="350"> , Team Sports, Holiday Decoration, Party Favors, promotional gifts, Awareness, Corporate Trade Shows, Political Campaigning or Memorials. A silicone wristband around the wrist can remind people of what it says. Is silicone wristband green and eco product？ A silicone wristband is made by the hydraulic press machine from 100% high quality silicone rubber. It will deformed and immediately restored as it’s tension and flexibility. Silicone wristband is a real green jewelry with wear-resistant , high temperature resistance, no deformation and no side effects on body. The silicon rubber is eco to human beings. The test report shows that it can reach the authority standards. Such as Regulation (EC) No.1907/2006 , European RoHS directive 2011/65/EU and It’s Amendment Directives , Annex XVII of Regulation (EC) No.1907/2006 custom-wristbands-in-bulkcustom-rubber-wristbands We are professional rubber bracelet maker with years of experience. Rubber bracelet is not only used as promotional gift, but also as a medical alert tool. Medical alert bracelets is commonly used. It is a high quality rubber bracelets with the ID printed on. We can print bar code, QR code or unique 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 cpersonalized anniversary braceletsode with a phone, the detail of patient name, disease, taboo drugs, status will show up. It is a good help for doctor and patient to know the treatment. All the medical bracelets should made from 100% silicone which is harmless and eco friendly to avoid secondary injury to patients. If the 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.