Adjustable neck sizing with a strap,a stainless tie clip included, easy to wear. The light up ties are made with the quality polyester microfiber and El-wire. It is great for clubs, weddings, dances, parties(costume party favors, masquerades, rave party, carnivals, ultra music festival, DJ party,etc),gifts and glow in the dark party show. Portable and easy to use - The battery pack can put in anywhere on your pockets. Light up, classy, and fashionable ties that will draw tons of attention.