Magnets for kalimba keys

If yu are fed up with having to change the tuning of you kalimba to obtain lower tones or alterations, you can use the magnet system. Each magnet lower the note half a tone. 2 magnets on tom of one another lower of 1 tone. You can add up to 3 magnets. Just place it on the good placing on your key, ,it will sing another note, and you 'll save you some time and work! Sold by 5 pieces.