No matter the excuse to party, if you are going to make some noise then these Sound Activated LED Flash Bracelets are a MUST!! Available in a variety of colors, these Sound Activated LED Flash Bracelets are great for admittance to concerts or outdoor live music events. Each Flashing LED Bracelet measures 4 inches in diameter, making these a standard one size fits most size. Make sure to grab a variety of colors and plenty for all of the guests to really electrify your event!