racelet can transfer it’s color darker under sunshine when absorbing UV light. It transfer to purple or blue normally which indicating the strength of the UV index. Wearing it on the wrist is a good way to avoid long timcustom usb bracelet wholesalee 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, suitable for various kinds of plastic PP, PVC, ABS, silicone rubber and other materials, such as the ejection, out of shape. waterproof-wristbands-for-eventsevent-wristbands-walmart Meaning Green Rubber Bracelets Green rubber bracelets are usually used to support ecology with messages like "SAVE OUR EARTH" and "PEACE", leukemia and Muscular Dystrophy with the message custom usb bracelet wholesale"I WILL" and organ donor-ship. Sometimes it is used for general cancer support. Lots of the time green just has fun and silly messages. Sometimes the green rubber bracelets glow in the dark. basketball-silicone-braceletswholesale-custom-wristbands Friendship bracelets are two or sereral bracelets that shows the friendship between friends. It is easy to make Friendship bracelets. We make it in different size. 202mm for adult, 190mm for women, 180mm for youth and 150mm for toddler. Some inspiraton and wish should be printed on the bracelets with letters. How to make letters on it ? There are normally two methods. One is silk print with the printed film. The silicone ink will be printed on the surface via the film. The letter can be small as it require the letter to be smallest at 0.1mm bold. So we can print more letters with silk print method. The other is colorfilled with a mould. It have a engraved effect with the ink filled in. It require the letter to be 0.3mm bold at least. Pls send me your message with letters and logos, our designer will check which method is best to make the friendship bracelet. We make the design for you free, no matter you order or not.