One size fits all. It is a fully adjustable neck sizing with a zipper feature. A full length tie measures 19 inches long from top knot to bottom tip.Features:One size fits all.It is a fully adjustable neck sizing with a zipper feature.A full length tie measures 19in long from top knot to bottom tip.Perfect for concerts, rave festivals, bars, clubs, electric glow run, LED parties, Halloween, costume parties, mardi gras, carnivals, gifts and more.Specifications:Light color: red, yellow, purple, blue, light green, dark green, pink, orange, dark blue, white (optional)Material: polyester yarnLength: 480mmBattery: 2 * AA battery (not included)Package size: 480 * 80 * 30mm / 18.9 * 3.1 * 1.2inPackage weight: 57g / 2.0ouncePackage list:1 * Tie