Dryer Balls will come cured and completely ready for use. When adding YOUR refresher vials please NOTE to let your wool balls completely dry for 48 hours. This will give the fragrance oil time to fully dry and be ready for the next use. This company is not responsible for Fragrance that could possibly affect clothing or skin. please use with caution and discontinue use if skin becomes irritated. PHOTO IS CREDITED TO CANVA PLUS!