Thank you for viewing! Percussion Tuning Keys Ludwig: 1 (for timpani) Yamaha: 2 Possibly Pearl: 1 (likely for timpani) I'm selling these because I no longer use them. Ludwig timpani tuning keys alone cost over 5,000 yen. With these tuning keys and a hex wrench/spanner, you can tune most percussion instruments found in schools without any problems. *Please understand that these are used items, and only purchase if you are okay with that.