ting the strength of the UV index. Wearing it on the wrist is a good way to avoid long time staying under strong sunshine. We add UV powder which is also green as silicone in production. The UV powder is kind of photochromic material. We use it to make this change. Photoreceptor color is irradiated by ultraviolet or sunlight, absorbs ultraviolet or sunlight, and produces changes in color. When it loses ultraviolet or sunlight, it returns to the original color. Photoreceptor products, after sunlight or ultraviolet radiation, can absorb the energy of the sun or ultraviolet rays, produce changes in the molecular structure, lead to changes in the absorption wavelength, and produce color changes; when the sun or ultraviolet energy is lost, the original molecular structure is restored and the color of the cost is reduced. Application of photosensitive discoloration material: coating, suitable for various surface coating products, including PMMA spray paint, ABS spray paint, PVC spray paint. Ink, printing of various materials, including fabric, paper, synthetic film, glass, etc. Plastic products, suitablcheap silicone wristbands uke for various kinds of plastic PP, PVC, ABS, silicone rubber and other materials, such as the ejection, out of shape. custom-camo-silicone-wristbandscool-silicone-wristbands nics and computers, household gardening supplies, toys, baby products, food, clothing, shoes and jewelcheap silicone wristbands ukry, health 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. We are a professional bracelet maker who provide cheap custom rubber bracelet of high quality. We have our own factory, production team, designing and sales team. We produce milions of bracelets per year wholesale price. All kinds of rubber bracelet are available. Silicone wristband is not only used as promotional gift, but also as a medical tool. Medical id bracelets is commonly used. It is a high quality silicone 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 code with a phone, the detail of patient name, disease, 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.