A nail sticker with a sweet vibe, it has donuts as a design and bling to make it fancier to look.. What's Inside. Component: 1 BTS x Gelato Factory Jellymix Nail Purple Donut (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.