General size (adult): 8rubber keyring "(L) x 1/2" (W) x 1/16"(H) or (202MM x 12MM x 2MM) Women"s size (adult): 7.5 "(L) x 1/2" (W) x 1/16"(H) or 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) The maximum screen printed and engraving area for adults is 7.677"X 0.334" The maximum area of screen printing and engraving for children is 7.00"X 0.334" As for width, commonly used are: 1/4 "or 6MM 1/2 "or 12MM 3/5 "or 15MM 3/4 "or 19MM 1 "or 25MM bracelet-silicone-personnalise-montrealembossed-wristbands Glow in dark silicone wristband is popular for night event. We add luminous powder into the wristband so it glows. A glow in dark silicone wristband can glow green or blue after absorbing strong light energy. We needrubber keyring to take it under the sunshine or lamp light for about half hour. Then it glows strongly in the dark. The glow will fade gradually in about 3h. It is the best one for night event. Such music show, night walk and so on. If you want the glow stronger, the wristband color need to be weaker. Because it is easier to absorb and release glowing. We have 7 colors for it now. 293c for blue, 802c for green, 803c for yellow, 804cfor orange, 179c for red, 196c for pink and 2655c for purple. The logo can be debossed, embossed or printed on the glowing wristbands.