This is a "soft type" ear tip that is unique to polyurethane material and fits perfectly into the ear canals. ●Effectively cuts out harmful high frequency noise from irritation. Material: Ear stopper material: Polyurethane; How to attach: (1) Roll as thin as possible with your finger. (2) Lift your ears and put them in the deep way. (Take the end out a few millimeters) (3) Inflates slowly and naturally to gently fit your ears. Note: Please keep out of reach of children. Please consult a specialist before using for those with otitis or allergic skin diseases. Do not use it for swimming. In order to avoid otitis, please wipe it with a dry cloth before wearing it, so please do not leave it wet. ·When removing it suddenly, it may damage your eardrums, so please pull it out slowly. Please do not use this product when lying down or sleeping. There is a possibility of pinching the ear into the ear.