Normally you can buy the silicone wristband at below common dimensions. General size (adult): 8 "(L) x 1/2" (W) x 1/16"(H) or (202 MM x 12 MM x 2 MM) Women"s Dimensions (Adults): 190 MM x 12MM x 2MM General size (children): 7"(L) x 1/2"(W) x 1/16"(H) or (180MM x 12MM x 2MM) 61/2 "(L) x 1/2" (W) x 1/16"(H) or (165MM x 12MM x 2MM) But we also can offer below extra large silicone wristbands. 8.25 "(L) x 1/2" (W) x 1/16"(H) or (210 MM x 12 MM x 2 MM) 8.65 "(L) x 1/2" (W) x 1/16"(H) or (220 MM x 12 MM x 2 MM) 9 "(L) x 1/2" (W) x 1/16"(H) or (230 MM x 12 MM x 2 MM) 9.85 "(L) x 1/2" (W) x 1/16"(H) or (250 MM x 12 MM x 2 MM) For the width,you can choose more than 1/2" (12mm). Such as 3/5"(15mm),3/4"(19mm) and 1"(25mm). Surely,if you have other extra large size need to do. We also can make the mould to do for you! So,any size will be ok! silicone-wristband-usb-flash-drivecheap-silicone-wristbands-canada d or debossed infil 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 custom military wristbandsbut 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 frocustom military wristbandsm light to dark. It become a uv silicone bracelet when the UV phosphor is put into the silicone mass and produce it a band.