It has an attractive design with purple gradation and lettering.. Enjoy the good vibes brought to you by the Dynamite song; these nail stickers have jelly glitters that shine on top of the base color.. What's Inside. Component: 1 BTS x Gelato Factory Jellymix Nail Purple City (DISCO Edition). How to use. Before attaching it, make sure to remove oil and water with the prep pad.. After attaching it, do not touch it with water for 2-3 hours.