washable and reusable. Applicable to any shape of nostrils. Gently insert into nostrils, It can unlock cavity and help breathing smoothly, removing nasal obstruction and increasing the flowing of air. Fits gently into nostrils, holding them wider apart and making breathing easier and quieter It can relieve the burden and pressure of respiratory system and circulatory system. Change the habit of oral respiration during sleeping and prevent upper respiratory infection. Comes with independent plastic protective case for easy carrying and storage.