Shure SCL2 Sound Isolating Earphones with Single Dynamic Driver, Black Sound Isolating Sleeves: Because every ear is different, the Fit Kit includes three sizes (S, M, L) of the orange foam, clear and gray flex sleeves. Experiment with the size and style that creates the best fit for you -- a good seal is key to optimizing sound isolation and bass response as well as maximizing comfort during extended wear. Carrying Case: A durable and compact carrying case is included with the SCL2 to provide a convenient, tangle-free solution to store your earphones. Wax Removal Tool : If you notice a change in sound quality, remove the sleeve and check the nozzle of your earphone. If nozzle is blocked, clear obstruction by using wire loop end of cleaning tool. Because every ear is different, the Fit Kit includes three sizes of the orange foam, clear and gray flex sleeves. A durable and compact carrying case is included with the SCL2 to provide a convenient Wax Removal Tool : If you notice a change in sound quality, remove the sleeve and check the nozzle of your earphone. Sound Isolating Sleeves: Because every ear is different, the Fit Kit includes three sizes (S, M, L) of the orange foam Carrying Case: A durable and compact carrying case is included with the SCL2 to provide a convenient Wax Removal Tool : If you notice a change in sound quality, remove the sleeve and check the nozzle of your earphone.