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 nd non-spraying hand-feeling oil is very different . Some novice friends don"t know the word "fuel injection" . The main purpose of fuel injection is to coat the surface of the product with a coat of paint to make it more comfortable for customers to wear . Oil injection has a good effect on the dust-proof and sticky-proof properties of silica gel bracelets . For example , some customers will ask us why the silicone wristband are often covered with dust . Actually , the reascustom wristbands los angeleson why rubber bracelet often stick to dust is that they don"t have any spray hand-feeling oil . The effect of silicone bracelets sprayed with hand-feeling oil is hard to see with the naked eye , and there is a distinction between the wristband sprayed with hand-feeling oil and non-spraying hand-feeling oil when we touch it . The main features of oil-sprayed silica gel hand rings are smooth handle , high surface finish and smoothness , no dust contamination . Silicone hand rings witcustom wristbands los angeleshout spray-feeling oil have low gloss , feel less smooth with hands , and their service life is not long .