For Shure Sound Isolating earphones E1, E3, E4, E5, SCL3, SCL4, SCL5, SE110, SE210, SE310, SE420, SE530, SE115, SE215, SE315, SE425, SE535. These reusable sleeves fit comfortably in the ear and allow for ease of insertion. Choose from three sizes (small, medium, large) for the best personal fit.