It transfer to purple or blue normallpersonalized rubber band braceletsy which indicating 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 ultravpersonalized rubber band braceletsiolet 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, suitable 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 r factory so all we give is whole sale price. We make all designs for free even it is an inquiry no matter you place the order or not. Low price, good quality and service is our rule. We are always strict in quality. It is easy to make a personalized wristband on our website. Select wristband style. The popular styles are debossed, embossed, colorfilled, printed and embossed printed. We shows all the feature of each one in our category page. Select size. Regular sizes of a silicone wristband are 6”(150mm) for toddler, 7”(180mm) for youth, 8”(202mm) for adult in circumference and 1/4”(6mm), 1/2”(12mm), 3/4”(19mm), 1”(25mm) in width. We make it all together 2mm thickness. Select colors and quantity. Enter the message you need to put on the wristband. You are able to make the message front and back or continuous outside. For the inside, the message can be printed or embossed. We are professional rubber bracelet manufacturer in US. We make all kinds of rubber bracelet with favorable price and high quality. The bracelet with 2 colors can be segment, swirl or dual layer ones. Swirled colors is more than one color, you can put two to four colors swirled in the bracelet. The colors looks like some coatings mixed half way, some stripe and smoke of color inside. The most outstanding swirled is a camouflage bracelet. A segmented bracelet gets regular color segment from one to another, they are next to each other. We can make mostly 7 colors in a segment, the tipical rainbow bracelet. We can maket the segment bracelet crosswise orlegnthwise. Dual layer rubber bracelet share different colors from outside and inside. 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.