glow in dark silicone bracelet is made by the same technology with the normal bracelet but adding the glow powder . The powder can be added into the band body or the ink for the printed or debossed colorfilled style bracelet. The glow powder is eco as well as the silicone material bracelet. When absorbs enough strong light before being put in the dark, it glows blue, green or red depending on the style of the glow power. The glow will last for hours and gradually weaken. But when reabsorbs the light , it glows again like original shows. It is the most favorable item for the night event. It looks so good in the dark reflecting the logo custom. Hope this can help you for the glow in dark silicone bracelets. A uv silicone bracelet 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 use uv energy to open the sensitive molecular bond and make it jump from low energy to high energy level. bracelet-en-silicone1-4-inch-silicone-bracelets s free no matter you place the order or not. Low price, good quality and service is our rule. If order less than 100pcs , get 50pcs free , order more than 100pcs , get 100pcs free. Themorse code bracelet custom free are of same design as ones you order. Besides, you can get 5-10pcs key chains. Larger amount, more favorable price. No MOQ, even 1pcs we will make. We are always strict in quality of our product focusing on edge cutting, polluted mark and printed logo to make a best product for you. Due to the prompt service of FedEx, UPS and DHL, we are able to make a 4 days order. Super rush order of 1 days production and 3 days shipping is available. It helps you achieve your promotional event. And we have ability to do international orders, only needs little international shipping fee extra. We are always on line for your order and inquiry, 24 hours a day, 365 days a year. You could contact us via live chat, hot line and emamorse code bracelet customil. If you place an order, you can pay it by PayPal, credit card or debit card. If you are not pay on line, we are able to send an invoice for which you can pay later. We will make and send you digital proof even it is just a quote. We will inform you the tracking number once it is ready. And we provide the best suggestion if order get stuck on the way. If you are not satisfied with our product or it gets delay, we will refund to you. Or if you need replacement of the defective wristband, we will also do it for you free. The business philosophy of responsibility and good faith ensure our service quality.