Most cajon players, or even solo acoustic singer/guitarists will naturally tap their foot or heel along with the beat of their music. Placing this MEINL heel shaker shaker in your shoe allows you to use this to create a new rhythmic element. It is motion activated by way of shakers mounted on an angle to respond with clarity along with the tapping movement of your heel. A great percussion piece for all musicians, simply position the plastic end into your shoe so that it rests against the back of your heel. The ergonomic design gives you comfort while keeping the instrument snug inside your shoe.