The Meinl magnetic Cymbal Tuners offer an easy way to tweak the sound of your cymbals. Simply place the magnets on the cymbal (mated up top and bottom). By positioning the Cymbal Tuners in different spots on the surface, you can control the sustain, dampen the tone, adjust the volume, and optimize the sound of your cymbal to just the way you like it. Package includes 2x big and 2x small magnets.