This glow bracelet is average size with inner diameter 2.35″, which is suitable for children and common adults, please make sure you know this available size. Turn bracelet on/off with little switch. Plastic material, bubble design, glow bracelets. Use these glow in the dark party favors as glow party decorations. Theses party bracelets are shiny and conspicuous in the dark when you raise or wave your arm, ideal for party events.