Large size: 35cm*4cm. This luminous armband is very lightweight, and will not add any extra burden to your arm. you can easily be seen from all angles with this safety band, adding visibility at night. lightweight and supple, the luminous armlet can be worn easily. Place Them Anywhere, On Your Wrists, Arms, Ankles. This LED Slap band provides 360 degree ultra-high visibility in dark and nighttime activities. This provides great safety protection for you, your children or your pet from negligent and distracted drivers. You can also wear it for night activity, such as your favorite singer’s concert or campfire evening party and etc. QTY over 10000 ship by sea.