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 stbands free & 5 pcs keychains free. Friendship bracelets are two or sereral bracelets that shows the fcustom logo keychainsriendship between team players, friends, classmates and so on. It is easy to make Friendship bracelets for famlies also. 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 wristbands. When graduate from school, some classmates will leave us. We can make bracelets to everybody for friendship. The bracelet can be colorful with segment or swirl style. It is cute to make camouflage, rainbow, glowing or UV wristband. All it can be customized icustom logo keychainsn our store. The logo can be embossed, debossed, colorfilled, printed or embossed printed. We can make our names, slogan and kit on it. Our designer will make the best design.