For Shure Sound Isolating Earphones E1, E3, E4, E5, SCL3, SCL4, SCL5, SE110, SE210, SE310, SE420, SE530, SE115, SE215, SE315, SE425, SE535, SE846. These reusable, silicone sleeves form a tighter seal than flex sleeves while holding the earphones firmly in place. The sleeve tube or flange can be trimmed for customization and greater comfort.